7714585f · 7714585f · 7714585f · 67f54ee0 · 67f54ee0 · 67f54ee0
86 changed file
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -6,78 +6,118 @@
 +   飞龙：562826179
-## 章节列表
+## 有用的链接
-+   [1.关于本书（ES2019 版）](docs/2.md)
+   [ApacheCN 文档导航](https://docs.apachecn.org/)
-+   [2.常见问题：本书](docs/3.md)
+   [谷歌翻译](https://translate.google.cn/)
-+   [3\. JavaScript 的历史和演变](docs/4.md)
+   [ApacheCN 校对活动参与手册](https://github.com/apachecn/home/blob/master/docs/translate/joining-guide.md)
-+   [4.常见问题：JavaScript](docs/5.md)
+   [译后编辑](https://www.bing.com/search?q=%E8%AF%91%E5%90%8E%E7%BC%96%E8%BE%91&mkt=zh-CN)
-+   [5.概览](docs/7.md)
+   [当翻译竟然变成了文本编辑——李笑来](https://zhuanlan.zhihu.com/p/465979584)
-+   [6.语法](docs/8.md)
+   [翻译引擎易错术语列表（欢迎补充）](https://github.com/apachecn/home/blob/master/docs/translate/trans-table.md)
-+   [7.在控制台上打印信息（`console.*`）](docs/9.md)
+   [廖雪峰 Git 教程](https://www.liaoxuefeng.com/wiki/896043488029600)
-+   [8.断言 API](docs/10.md)
-+   [9.测验和练习入门](docs/11.md)
-+   [10.变量和赋值](docs/13.md)
-+   [11.值](docs/14.md)
-+   [12.运算符](docs/15.md)
-+   [13.非值`undefined`和`null`](docs/17.md)
-+   [14.布尔值](docs/18.md)
-+   [15.数字](docs/19.md)
-+   [16\. `Math`](docs/20.md)
-+   [17\. Unicode - 简要介绍（高级）](docs/21.md)
-+   [18.字符串](docs/22.md)
-+   [19.使用模板字面值和标记模板](docs/23.md)
-+   [20.符号](docs/24.md)
-+   [21.控制流语句](docs/26.md)
-+   [22.异常处理](docs/27.md)
-+   [23.可调用值](docs/28.md)
-+   [24.模块](docs/30.md)
-+   [25.单个对象](docs/31.md)
-+   [26.原型链和类](docs/32.md)
-+   [27.同步迭代](docs/34.md)
-+   [28.数组（`Array`）](docs/35.md)
-+   [29.类型化数组：处理二进制数据（高级）](docs/36.md)
-+   [30.映射（`Map`）](docs/37.md)
-+   [31\. WeakMaps（`WeakMap`）](docs/38.md)
-+   [32.集（`Set`）](docs/39.md)
-+   [33\. WeakSets（`WeakSet`）](docs/40.md)
-+   [34.解构](docs/41.md)
-+   [35.同步生成器（高级）](docs/42.md)
-+   [36\. JavaScript 中的异步编程](docs/44.md)
-+   [37.异步编程的 Promise](docs/45.md)
-+   [38.异步函数](docs/46.md)
-+   [39.正则表达式（`RegExp`）](docs/48.md)
-+   [40.日期（`Date`）](docs/49.md)
-+   [41.创建和解析 JSON（`JSON`）](docs/50.md)
-+   [42.其余章节在哪里？](docs/51.md)
 ## 流程
 ### 一、认领
-首先查看[整体进度](https://github.com/apachecn/impatient-js-zh/issues/1)，确认没有人认领了你想认领的章节。
+校对者需要熟练掌握 Markdown 和 Git，以及文档的主题（编程，Web开发，大数据，AI，安全之一）。
+首先查看[整体进度](https://github.com/apachecn/ds-cmd-line-2e-zh/issues/1)，确认没有人认领了你想认领的章节。
-然后回复 ISSUE，注明“章节 + QQ 号”（一定要留 QQ）。
+然后回复 ISSUE，注明“章节 + QQ 号”，便于联系和跟踪进度。
 ### 二、校对
-需要校对：
+需要校对【专业术语】和【格式】。
-+   部分语法
+【语法】无需校对因为已经校对完了，并且请最大程度保留原文的语言风格。
-+   专业词汇
-+   格式
 译文在`docs`目录下，原文请见每个文章开头处的链接。
-请见[校对活动参与手册](https://github.com/apachecn/home/blob/master/docs/translate/joining-guide.md)来提高效率。
 **注意**：不要修改译文的文件名，因为它们和章节对应！
+确保译文符合下方的【Markdown 排版要求】一节。
+请参考下方的【有用的正则表达式】一节，以及[【翻译引擎易错术语列表】](https://github.com/apachecn/home/blob/master/docs/translate/trans-table.md)来提高效率。
 ### 三、提交
 +   `fork` Github 项目
-+   修改`docs`中的文档。
+   在`docs`文件夹下编辑译文
-+   `push`
+   `add`、`commit`和`push`
 +   `pull request`
-请见 [Github 入门指南](https://github.com/apachecn/kaggle/blob/master/docs/GitHub)。
+请见[廖雪峰 Git 教程](https://www.liaoxuefeng.com/wiki/896043488029600)。
+## Markdown 排版要求
+1.  代码块和图片无需校对，并且不计入字数。
+3.  汉字和英文字母，汉字和数字之间空一格。但是中文标点和任何字符之间都不用空格。
+4.  粗体斜体和链接要求同上，中文和英文粗体，英文和中文粗体之间也需要空格。
+5.  任何编程语言中出现的东西，比如变量名，类名，函数名，包名，以及命令行中出现的东西，比如命令，文件名，路径，扩展名，都需要包在内联代码中。内联代码与汉字/标点之间无需空格，但和英文字母或数字之间空一格。
+6.  表格的格式容易乱，保证它们显示正常。
+7.  标题和较短的列表需要特别校对。
+8.  有少量未翻译的段落，使用[谷歌翻译](https://translate.google.cn/)之后再校对。
+## 有用的正则表达式
+链接：
+```
+(?<!!)\[[^\]]*\]
+```
+表格：
+```
+^\|
+```
+中文间空格：
+中文间空格一般是翻译引擎出错的地方。
+```
+[\u4e00-\u9fff]\s+[\u4e00-\u9fff]
+```
+未翻译段落：
+```
+^[a-zA-Z0-9][^\u4e00-\u9fff]+$
+^\s*([\+\-\*]\x20{3}|\d+\.\x20{2})[^\u4e00-\u9fff]+$
+```
+内联代码：
+在 Markdown 中，内联代码需要用反引号括起来，但一些教程并没有这样做。于是，需要检查中英文边界，将没有用反引号括起来的内联代码改掉。
+```
+[\u2018-\u201d\u3001-\u301c\u4e00-\u9fff\uff01-\uff65]\x20*[A-Za-z0-9]|[A-Za-z0-9]\x20*[\u2018-\u201d\u3001-\u301c\u4e00-\u9fff\uff01-\uff65]
+```
+粗体/斜体：
+```
+\*\*[^\*]+\*\*|(?<!\*)\*[^\*]+\*(?!\*)
+```
+标题：
+```
+^#+\x20
+```
+列表（二十字以内）：
+短的列表由于没有上下文非常容易出错。
+```
+^\s*([\+\-\*]\x20{3}|\d+\.\x20{2}).{1,20}$
+```
+## 奖励
+校对者在完工后可以领取千字2~4元的奖励（视难度和工作量而定），请联系飞龙（Q562826179，V:wizardforcel）。
+字数统计遵循 word 标准：每一个汉字和标点算一个字，一个连续的英文字母、数字和标点序列算一个字
--- a/README.md
+++ b/README.md
@@ -64,4 +64,6 @@ impatient-js-zh <port>
 ## 赞助我们
-![](http://data.apachecn.org/img/about/donate.jpg)
+本项目由[飞龙](https://github.com/wizardforcel)赞助，扫下面的二维码打赏他来表示感谢：
+![](asset/flygon_qr_alipay.png)
--- a/asset/flygon_qr_alipay.png
+++ b/asset/flygon_qr_alipay.png
--- a/quiz/README.txt
+++ b/quiz/README.txt
-# Code for “JavaScript for impatient programmers”
-## Installation
-1. Requirement: Node.js must be installed. https://nodejs.org/
-  * The version must be at least 11.11.0 (checked during installation test, see below)
-  * See the version of your Node.js: `node -v`
-2. Installing this repository:
-  ```
-  cd impatient-js-code/
-  npm install
-  ```
-3. Checking that everything was installed correctly (the “t” is an abbreviation for “test”):
-  ```
-  npm t installation_test.mjs
-  ```
-## Running exercises
-Each exercise/test file:
-* mentions the command for running the exercise via a command line.
-* gives instructions for solving the exercise.
--- a/quiz/demos/quizzes-exercises/id.mjs
+++ b/quiz/demos/quizzes-exercises/id.mjs
-export function id(x) {
-  return x;
-}
--- a/quiz/demos/quizzes-exercises/id_test.mjs
+++ b/quiz/demos/quizzes-exercises/id_test.mjs
-// npm t demos/quizzes-exercises/id_test.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {id} from './id.mjs';
-test('My test', t => {
-  assert.equal(id('abc'), 'abc');
-});
--- a/quiz/exercises/booleans/default_via_or_exrc.mjs
+++ b/quiz/exercises/booleans/default_via_or_exrc.mjs
-/* npm t exercises/booleans/default_via_or_exrc.mjs
-Instructions:
- Run test (it succeeds).
- Change getFilename() so that it only contains a return of an expression with the || operator.
- Run the test again, it should still succeed.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-function getFilename(options) {
-    if (options.filename) {
-        return options.filename;
-    } else {
-        return 'Untitled';
-    }
-}
-test('Default via ||', t => {
-    assert.equal(getFilename({}), 'Untitled'); // empty object
-    assert.equal(getFilename({filename: 'foo.txt'}), 'foo.txt');
-});
--- a/quiz/exercises/booleans/truthiness_exrc.mjs
+++ b/quiz/exercises/booleans/truthiness_exrc.mjs
-/* npm t exercises/booleans/truthiness_exrc.mjs
-Instructions:
- Run this test (it fails).
- Change the second parameters of assert.equal() so that the test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('truthiness', t => {
-  assert.equal(Boolean(null), 'some value');
-  assert.equal(Boolean(undefined), 'some value');
-  assert.equal(Boolean(''), 'some value');
-  assert.equal(Boolean('abc'), 'some value');
-  assert.equal(Boolean(0), 'some value');
-  assert.equal(Boolean(123), 'some value');
-  assert.equal(Boolean({}), 'some value');
-  assert.equal(Boolean([]), 'some value');
-});
--- a/quiz/exercises/callables/named_parameters.mjs
+++ b/quiz/exercises/callables/named_parameters.mjs
-export function handleNamedParameters(params) {
-    params = params || {};
-    var x = params.x || 0;
-    var y = params.y || 0;
-    var color = params.color || 'black';
-    return [x, y, color];
-}
--- a/quiz/exercises/callables/named_parameters_test.mjs
+++ b/quiz/exercises/callables/named_parameters_test.mjs
-/* npm t exercises/callables/named_parameters_test.mjs
-Instructions:
- Change the ES5 code in named_parameters.mjs so that it uses ES6 and destructuring
- Make sure the tests still pass
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {handleNamedParameters} from './named_parameters.mjs';
-test('All named parameters', t => {
-    assert.deepEqual(
-        handleNamedParameters({ x: 1, y: 2, color: 'red' }),
-        [1, 2, 'red']);
-});
-test('Omitting named parameters', t => {
-    assert.deepEqual(
-        handleNamedParameters({ x: 1, y: 2 }),
-        [1, 2, 'black']);
-    assert.deepEqual(
-        handleNamedParameters({ color: 'red' }),
-        [0, 0, 'red']);
-    assert.deepEqual(
-        handleNamedParameters({}),
-        [0, 0, 'black']);
-});
-test('Omitting named parameter object', t => {
-    assert.deepEqual(
-        handleNamedParameters(),
-        [0, 0, 'black']);    
-});
--- a/quiz/exercises/callables/positional_parameters_test.mjs
+++ b/quiz/exercises/callables/positional_parameters_test.mjs
-/* npm t exercises/callables/positional_parameters_test.mjs
-Instructions:
-– Implement positional_parameters.mjs so that it passes the test.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {twoParametersWithDefaultValues, restParameters} from './positional_parameters.mjs';
-test('twoParametersWithDefaultValues', t => {
-  assert.deepEqual(twoParametersWithDefaultValues(), [0, 0]);
-  assert.deepEqual(twoParametersWithDefaultValues(1), [1, 0]);
-  assert.deepEqual(twoParametersWithDefaultValues(1, 2), [1, 2]);
-  assert.deepEqual(twoParametersWithDefaultValues(1, 2, 3), [1, 2]);
-});
-test('restParameters', t => {
-  assert.deepEqual(restParameters(), []);
-  assert.deepEqual(restParameters(1), []);
-  assert.deepEqual(restParameters(1, 2), [2]);
-  assert.deepEqual(restParameters(1, 2, 3, 4), [2, 3, 4]);
-  assert.deepEqual(restParameters(1, 2, 3, 4, 5), [2, 3, 4, 5]);
-  assert.deepEqual(restParameters(1, 2, 3, 4, 5, 6), [2, 3, 4, 5, 6]);
-  assert.deepEqual(restParameters(1, 2, 3, 4, 5, 6, 7), [2, 3, 4, 5, 6, 7]);
-});
--- a/quiz/exercises/control-flow/array_to_string_test.mjs
+++ b/quiz/exercises/control-flow/array_to_string_test.mjs
-/* npm t exercises/control-flow/array_to_string_test.mjs
-Instructions:
-– Implement array_to_string.mjs so that it passes the test.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {arrayToString} from './array_to_string.mjs';
-test('arrayToString', t => {
-  const CMYK = [
-    'cyan',
-    'magenta',
-    'yellow',
-    'key',
-  ];
-  assert.equal(arrayToString(CMYK), `
-1. cyan
-2. magenta
-3. yellow
-4. key
-  `.trim());
-});
--- a/quiz/exercises/control-flow/is_object_via_switch.mjs
+++ b/quiz/exercises/control-flow/is_object_via_switch.mjs
-export function isObject(x) {
-  return x !== null && (typeof x === 'object' || typeof x === 'function');
-}
--- a/quiz/exercises/control-flow/is_object_via_switch_test.mjs
+++ b/quiz/exercises/control-flow/is_object_via_switch_test.mjs
-/* npm t exercises/control-flow/is_object_via_switch_test.mjs
-Instructions:
-– Change is_object_via_switch.mjs so that it uses a switch statement
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {isObject} from './is_object_via_switch.mjs';
-test('isObject via switch', t => {
-  assert.equal(isObject(undefined), false);
-  assert.equal(isObject(null), false);
-  assert.equal(isObject(true), false);
-  assert.equal(isObject(123), false);
-  assert.equal(isObject('abc'), false);
-  assert.equal(isObject(function () {}), true);
-  assert.equal(isObject({}), true);
-  assert.equal(isObject([]), true);
-});
--- a/quiz/exercises/control-flow/number_to_month_test.mjs
+++ b/quiz/exercises/control-flow/number_to_month_test.mjs
-/* npm t exercises/control-flow/number_to_month_test.mjs
-Instructions:
-– Implement number_to_month.mjs so that it passes the test.
-– Errors are thrown via: throw new Error(str)
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {numberToMonth} from './number_to_month.mjs';
-test('numberToMonth', t => {
-  assert.equal(numberToMonth(1), 'January');
-  assert.throws(() => numberToMonth(0), /^Error: Unknown number: 0$/);
-});
--- a/quiz/exercises/exception-handling/call_function.mjs
+++ b/quiz/exercises/exception-handling/call_function.mjs
-export function callFunction(func) {
-  const result = func();
-  return {
-    success: result,
-  };      
-}
\ No newline at end of file
--- a/quiz/exercises/exception-handling/call_function_test.mjs
+++ b/quiz/exercises/exception-handling/call_function_test.mjs
-/* npm t exercises/exception-handling/call_function_test.mjs
-Instructions:
-– Change call_function.mjs so that it passes the test.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {callFunction} from './call_function.mjs';
-test('monthToNumber', t => {
-  assert.deepEqual(
-    callFunction(() => { return 'abc' }),
-    { success: 'abc' });
-  const err = new Error('Failed!');
-  assert.deepEqual(
-    callFunction(() => { throw err }),
-    { failure: err });
-});
--- a/quiz/exercises/modules/export_default_test.mjs
+++ b/quiz/exercises/modules/export_default_test.mjs
-/* npm t exercises/modules/export_default_test.mjs
-Instructions:
-– Create export_default.mjs so that this test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import func from './export_default.mjs';
-test('export_default', t => {
-    assert.equal(func(), 'hello');
-});
--- a/quiz/exercises/modules/export_named_test.mjs
+++ b/quiz/exercises/modules/export_named_test.mjs
-/* npm t exercises/modules/export_named_test.mjs
-Instructions:
-– Create export_named.mjs so that this test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {func} from './export_named.mjs';
-test('export_named', t => {
-    assert.equal(func(), 'hello');
-});
--- a/quiz/exercises/numbers-math/find_max_test.mjs
+++ b/quiz/exercises/numbers-math/find_max_test.mjs
-/* npm t exercises/numbers-math/find_max_test.mjs
-Instructions:
- Create the file find_max.mjs
- Ensure this test passes
-– Use function addAll() from this file as a template.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {findMax} from './find_max.mjs';
-test('findMax', t => {
-	assert.equal(findMax([]), -Infinity);
-	assert.equal(findMax([8]), 8);
-	assert.equal(findMax([-20, -3, -15]), -3);
-	assert.equal(findMax([100, 200, 5]), 200);
-});
-//----------
-function addAll(nums) {
-	let result = 0;
-	for (const num of nums) {
-		result += num;
-	}
-	return result;
-}
-test('addAll', t => {
-	assert.equal(addAll([]), 0);
-	assert.equal(addAll([4]), 4);
-	assert.equal(addAll([1, 2]), 3);
-	assert.equal(addAll([100, 200, 500]), 800);
-});
--- a/quiz/exercises/numbers-math/is_odd_test.mjs
+++ b/quiz/exercises/numbers-math/is_odd_test.mjs
-/* npm t exercises/numbers-math/is_odd_test.mjs
-Instructions:
- Create the file is_odd.mjs
- Ensure the test passes
- Possibly useful: Math.abs()
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {isOdd} from './is_odd.mjs';
-test('isOdd', t => {
-	assert.equal(isOdd(3), true);
-	assert.equal(isOdd(-3), true);
-	assert.equal(isOdd(10001), true);
-	assert.equal(isOdd(0), false);
-	assert.equal(isOdd(2), false);
-	assert.equal(isOdd(-2), false);
-	assert.equal(isOdd(10000), false);
-});
--- a/quiz/exercises/numbers-math/is_safe_integer_test.mjs
+++ b/quiz/exercises/numbers-math/is_safe_integer_test.mjs
-/* npm t exercises/numbers-math/is_safe_integer_test.mjs
-Instructions:
- Create the file is_safe_integer.mjs
- Ensure the test passes
-– Don’t use Number.isInteger()
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {isSafeInteger} from './is_safe_integer.mjs';
-test('Is it an integer?', t => {
-  assert.equal(isSafeInteger(123), true);
-  assert.equal(isSafeInteger(123.1), false);
-  // We don’t want isSafeInteger() to coerce its arguments
-  assert.equal(isSafeInteger('123'), false);
-  assert.equal(isSafeInteger(true), false);
-});
-test('Is it safe?', t => {
-  assert.equal(isSafeInteger(2 ** 53), false);
-  assert.equal(isSafeInteger(-(2 ** 53)), false);
-  assert.equal(isSafeInteger((2 ** 53)-1), true);
-  assert.equal(isSafeInteger(-(2 ** 53)+1), true);
-  assert.equal(isSafeInteger(0), true);
-  assert.equal(isSafeInteger(5), true);
-  assert.equal(isSafeInteger(-5), true);
-});
--- a/quiz/exercises/numbers-math/parse_number_test.mjs
+++ b/quiz/exercises/numbers-math/parse_number_test.mjs
-/* npm t exercises/numbers-math/parse_number_test.mjs
-Instructions:
- Create the file parse_number.mjs
- Ensure the test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {parseNumber} from './parse_number.mjs';
-test('parseNumber', t => {
-  assert.equal(parseNumber('16'), 16);
-  assert.equal(parseNumber(''), 0);
-  // Whitespace
-  assert.equal(parseNumber('\t 123 \n'), 123);
-  // Other non-digit characters
-  assert.equal(parseNumber('456#'), NaN);
-  // Hexadecimal integer number
-  assert.equal(parseNumber('0xFF'), 255);
-  // Binary integer number
-  assert.equal(parseNumber('0b111'), 7);
-});
--- a/quiz/exercises/proto-chains-classes/color_point_class_test.mjs
+++ b/quiz/exercises/proto-chains-classes/color_point_class_test.mjs
-/* npm t exercises/proto-chains-classes/color_point_class_test.mjs
-Instructions:
- Create the file color_point_class.mjs
- Ensure the test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {Point} from './point_class.mjs';
-import {ColorPoint} from './color_point_class.mjs';
-test('Class ColorPoint', t => {
-  const cpt = new ColorPoint(4, 7, 'red');
-  assert.ok(cpt instanceof Point);
-  assert.ok(cpt instanceof ColorPoint);
-  assert.equal(cpt.toString(), `(4, 7) in red`);
-});
--- a/quiz/exercises/proto-chains-classes/point_class_test.mjs
+++ b/quiz/exercises/proto-chains-classes/point_class_test.mjs
-/* npm t exercises/proto-chains-classes/point_class_test.mjs
-Instructions:
- Create the file point_class.mjs
- Ensure the test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {Point} from './point_class.mjs';
-test('Class Point', t => {
-  const pt = new Point(4, 7);
-  assert.equal(pt.x, 4);
-  assert.equal(pt.y, 7);
-  assert.equal(pt.dist(), Math.sqrt(4**2 + 7**2));
-  assert.equal(pt.toString(), `(4, 7)`);
-});
--- a/quiz/exercises/proto-chains-classes/string_builder_symbol.mjs
+++ b/quiz/exercises/proto-chains-classes/string_builder_symbol.mjs
-export class StringBuilder {
-  constructor() {
-    this._data = '';
-  }
-  add(str) {
-    this._data += str;
-    return this;
-  }
-  toString() {
-    return this._data;
-  }
-}
--- a/quiz/exercises/proto-chains-classes/string_builder_symbol_test.mjs
+++ b/quiz/exercises/proto-chains-classes/string_builder_symbol_test.mjs
-/* npm t exercises/proto-chains-classes/string_builder_symbol_test.mjs
-Instructions:
- Change string_builder_symbol.mjs: use symbols for private data, not property names with underscores
- Make sure the tests still pass
-Similar exercise: exercises/weakmaps/weakmaps_private_data_test.mjs
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {StringBuilder} from './string_builder_symbol.mjs';
-test('Empty StringBuilder', t => {
-  assert.equal(new StringBuilder().toString(), '');
-});
-test('Adding strings to a StringBuilder', t => {
-  assert.equal(new StringBuilder().add('foo').add('bar').toString(), 'foobar');
-});
-test('Rule out singleton implementations', t => {
-  const sb1 = new StringBuilder().add('sb1');
-  const sb2 = new StringBuilder().add('sb2');
-  assert.equal(sb1.toString(), 'sb1');
-  assert.equal(sb2.toString(), 'sb2');
-});
-test('Is private data hidden?', t => {
-  const sb = new StringBuilder();
-  assert.deepEqual(Object.getOwnPropertyNames(sb), []);
-});
--- a/quiz/exercises/quizzes-exercises/first_module.mjs
+++ b/quiz/exercises/quizzes-exercises/first_module.mjs
-// We export a function so that the test can import it
-export function hello(x) {
-  return 'Goodbye ' + x + '!';
-}
--- a/quiz/exercises/quizzes-exercises/first_module_test.mjs
+++ b/quiz/exercises/quizzes-exercises/first_module_test.mjs
-/* npm t exercises/quizzes-exercises/first_module_test.mjs
-Instructions:
- Run the test (fails)
- Change first_module.mjs so that the test passes.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {hello} from './first_module.mjs';
-test('First exercise', t => {
-  assert.equal(hello('world'), 'Hello world!');
-  assert.equal(hello('Jane'), 'Hello Jane!');
-  assert.equal(hello('John'), 'Hello John!');
-  assert.equal(hello(''), 'Hello !');
-});
--- a/quiz/exercises/single-objects/color_point_object_test.mjs
+++ b/quiz/exercises/single-objects/color_point_object_test.mjs
-/* npm t exercises/single-objects/color_point_object_test.mjs
-Instructions:
- Create the file color_point_object.mjs
- Ensure the test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {colorPoint} from './color_point_object.mjs';
-test('Object colorPoint', t => {
-  assert.equal(colorPoint.x, 3);
-  assert.equal(colorPoint.y, 5);
-  assert.equal(colorPoint.dist(), Math.sqrt(3**2 + 5**2));
-  assert.equal(colorPoint.toString(), `(3, 5)`);
-  colorPoint.x = 2;
-  colorPoint.y = 4;
-  assert.equal(colorPoint.x, 2);
-  assert.equal(colorPoint.y, 4);
-  assert.equal(colorPoint.dist(), Math.sqrt(2**2 + 4**2));
-  assert.equal(colorPoint.toString(), `(2, 4)`);
-});
--- a/quiz/exercises/single-objects/find_key_test.mjs
+++ b/quiz/exercises/single-objects/find_key_test.mjs
-/* npm t exercises/single-objects/find_key_test.mjs
-Instructions:
-– Implement find_key.mjs so that the test passes. Use Object.entries() to do so.
-– findKey(object, callback) returns the first property key for which callback(propValue, propKey, object) returns true.
-– Inspired by Underscore function _.findKey(): https://underscorejs.org/#findKey
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {findKey} from './find_key.mjs';
-test('Find key via value', t => {
-  assert.equal(
-    findKey({a:1, b:2, c:3}, (v) => v > 1),
-    'b'
-  );
-});
-test('Find key via key', t => {
-  assert.equal(
-    findKey({a:1, bb:2, ccc:3}, (_v, k) => k.length > 2),
-    'ccc'
-  );
-});
-test('Is object passed to callback?', t => {
-  const obj = {a:1, b:2, c:3};
-  findKey(obj, (v, k, o) => assert.equal(o, obj));
-});
--- a/quiz/exercises/single-objects/method_extraction_exrc.mjs
+++ b/quiz/exercises/single-objects/method_extraction_exrc.mjs
-/* npm t exercises/single-objects/method_extraction_exrc.mjs
-Instructions:
- Run this test (fails)
- Change the code so that the test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-const jane = {
-  first: 'Jane',
-  describe() {
-    return `Person named ${this.first}`;
-  },
-};
-test('method_extraction_exrc', t => {
-  const func = jane.describe;
-  assert.equal(func(), 'Person named Jane');
-  jane.first = 'John';
-  assert.equal(func(), 'Person named John');
-});
--- a/quiz/exercises/single-objects/omit_properties_test.mjs
+++ b/quiz/exercises/single-objects/omit_properties_test.mjs
-/* npm t exercises/single-objects/omit_properties_test.mjs
-Instructions:
-– Implement omit_properties.mjs so that the test passes. Use Object.entries() and Object.fromEntries() to do so.
-– omitProperties(object, ...keys) returns a shallow copy of `object` that has all of the properties of the original except for those whose `keys` are mentioned at the end.
-– Inspired by Underscore function _.omit(): https://underscorejs.org/#omit
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {omitProperties} from './omit_properties.mjs';
-test('omitProperties', t => {
-  const obj = {a: 1, b: 2, c: 3};
-  assert.deepEqual(
-    omitProperties(obj), // omit nothing
-    {a: 1, b: 2, c: 3}
-  );
-  assert.deepEqual(
-    omitProperties(obj, 'c'),
-    {a: 1, b: 2}
-  );
-  assert.deepEqual(
-    omitProperties(obj, 'c', 'b'),
-    {a: 1}
-  );
-  assert.deepEqual(
-    omitProperties(obj, 'a', 'c'),
-    {b: 2}
-  );
-  assert.deepEqual(
-    omitProperties(obj, 'a', 'c', 'b'), // omit everything
-    {}
-  );
-});
--- a/quiz/exercises/single-objects/simple_dict_test.mjs
+++ b/quiz/exercises/single-objects/simple_dict_test.mjs
-/* npm t exercises/single-objects/simple_dict_test.mjs
-Instructions:
- Implement simple_dict.mjs so that the test passes.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import { createDict, setValue, getValue, hasKey, getKeys } from './simple_dict.mjs';
-test('updateProperty: update existing property', t => {
-  const dict = createDict();
-  setValue(dict, '__proto__', 'abc');
-  assert.equal(getValue(dict, '__proto__'), 'abc');
-  assert.ok(hasKey(dict, '__proto__'));
-  setValue(dict, 'foo', 123);
-  assert.equal(getValue(dict, 'foo'), 123);
-  assert.ok(hasKey(dict, 'foo'));
-  assert.deepEqual(hasKey(dict, 'toString'), false);
-  // Keys are listed in creation order!
-  assert.deepEqual(getKeys(dict), ['__proto__', 'foo']);
-});
--- a/quiz/exercises/single-objects/update_name_test.mjs
+++ b/quiz/exercises/single-objects/update_name_test.mjs
-/* npm t exercises/single-objects/update_name_test.mjs
-Instructions:
- Create the file update_name.mjs so that the tests pass.
- Use spreading.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {updateName} from './update_name.mjs';
-test('updateName: update existing property', t => {
-  const input = { name: 'John', age: 54 };
-  const output = updateName(input, 'Jane');
-  // The function must return a copy, not the original:
-  assert.notEqual(input, output);
-  assert.deepEqual(output, { name: 'Jane', age: 54 });
-});
-test('updateName: add new property', t => {
-  const input = {};
-  const output = updateName(input, 'Rumpelstiltskin');
-  // The function must return a copy, not the original:
-  assert.notEqual(input, output);
-  assert.deepEqual(output, { name: 'Rumpelstiltskin' });
-});
--- a/quiz/exercises/single-objects/update_property_test.mjs
+++ b/quiz/exercises/single-objects/update_property_test.mjs
-/* npm t exercises/single-objects/update_property_test.mjs
-Instructions:
- Create the file update_property.mjs so that the tests pass.
- Use spreading.
-– Same as update_name.mjs, but with arbitrary keys
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {updateProperty} from './update_property.mjs';
-test('updateProperty: update existing property', t => {
-  const input = { name: 'Jane', age: 54 };
-  const output = updateProperty(input, 'age', 82);
-  // The function must return a copy, not the original:
-  assert.notEqual(input, output);
-  assert.deepEqual(output, { name: 'Jane', age: 82 });
-});
-test('updateProperty: add new property', t => {
-  const input = {};
-  const output = updateProperty(input, 'data', 123);
-  // The function must return a copy, not the original:
-  assert.notEqual(input, output);
-  assert.deepEqual(output, { data: 123 });
-});
--- a/quiz/exercises/strings/concat_string_array_test.mjs
+++ b/quiz/exercises/strings/concat_string_array_test.mjs
-/* npm t exercises/strings/concat_string_array_test.mjs
-Instructions:
- Create the file concat_string_array.mjs
- Ensure this test passes
-– Use function logStringArray() from this file as a template.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {concatStringArray} from './concat_string_array.mjs';
-test('concatStringArray', t => {
-  assert.equal(concatStringArray([]), '');
-  assert.equal(concatStringArray(['abc']), 'abc');
-  assert.equal(concatStringArray(['x', 'y', 'z']), 'xyz');
-});
-//----------
-function logStringArray(stringArray) {
-  for (const str of stringArray) {
-    console.log(str);
-  }
-}
--- a/quiz/exercises/strings/remove_extension_test.mjs
+++ b/quiz/exercises/strings/remove_extension_test.mjs
-/* npm t exercises/strings/remove_extension_test.mjs
-Instructions:
- Create the file remove_extension.mjs
- Ensure this test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {removeExtension} from './remove_extension.mjs';
-test('removeExtension', t => {
-	assert.equal(removeExtension(''), '');
-    assert.equal(removeExtension('foo.txt'), 'foo');
-    assert.equal(removeExtension('foo.mjs'), 'foo');
-    assert.equal(removeExtension('foo.tar.gz'), 'foo.tar');
-    assert.equal(removeExtension('foo'), 'foo');
-    assert.equal(removeExtension('.foo'), '');
-});
--- a/quiz/exercises/symbols/has_instance_test.mjs
+++ b/quiz/exercises/symbols/has_instance_test.mjs
-/* npm t exercises/symbols/has_instance_test.mjs
-Instructions:
- Implement has_instance.mjs so that the test passes.
-– Use the property key Symbol.hasInstance
-– Syntax for creating the class PrimitiveString: check the material on symbols
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import { PrimitiveString } from './has_instance.mjs';
-test('Symbol.hasInstance', t => {
-  assert.equal('abc' instanceof String, false);
-  assert.equal(new String('abc') instanceof String, true);
-  assert.equal('abc' instanceof PrimitiveString, true);
-  assert.equal(new String('abc') instanceof PrimitiveString, false);
-  assert.equal(123 instanceof PrimitiveString, false);
-});
--- a/quiz/exercises/symbols/to_string_tag_test.mjs
+++ b/quiz/exercises/symbols/to_string_tag_test.mjs
-/* npm t exercises/symbols/to_string_tag_test.mjs
-Instructions:
- Implement to_string_tag.mjs so that the test passes.
-– Use the property key Symbol.toStringTag
-– Syntax for creating the object SPECIAL_OBJECT: check the material on symbols
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import { SPECIAL_OBJECT } from './to_string_tag.mjs';
-test('Symbol.toStringTag', t => {
-  assert.equal(String({}), '[object Object]'); // default
-  // Instance property [Symbol.toStringTag] must be changed
-  assert.notEqual(SPECIAL_OBJECT[Symbol.toStringTag], Object.prototype[Symbol.toStringTag]);
-  // Method .toString() must not be changed
-  assert.equal(SPECIAL_OBJECT.toString, {}.toString);
-  assert.equal(String(SPECIAL_OBJECT), '[object Hello]');
-});
--- a/quiz/exercises/template-literals/templating_test.mjs
+++ b/quiz/exercises/template-literals/templating_test.mjs
-/* npm t exercises/template-literals/templating_test.mjs
-Instructions: Implement templating.mjs
-– Use the HTML templating technique as described in the slides.
-– You don’t need to escape the template data.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {arrayWithObjectsToTable, arrayToUnorderedListWithEscaping} from './templating.mjs'
-test('arrayWithObjectsToTable', t => {
-  const data = [
-    { first: 'Lars', last: 'Croft' },
-    { first: 'Jane', last: 'Bond' },
-  ];
-  // Lenient testing via .trim()
-  assert.equal(arrayWithObjectsToTable(data).trim(),
-`<table>
-  <tr><td>Croft</td><td>Lars</td></tr>
-  <tr><td>Bond</td><td>Jane</td></tr>
-</table>`);
-});
-//---------- Bonus (remove "#bonus" to activate)
-test('arrayToUnorderedListWithEscaping #bonus', t => {
-  const data = [
-    '<first item>',
-    'second item',
-  ];
-  assert.equal(arrayToUnorderedListWithEscaping(data).trim(), `
-<ul>
-  <li>&lt;first item&gt;</li>
-  <li>second item</li>
-</ul>
-  `.trim());
-});
--- a/quiz/exercises/values/conversion_exrc.mjs
+++ b/quiz/exercises/values/conversion_exrc.mjs
-/* npm t exercises/values/conversion_exrc.mjs
-Instructions:
- Run this test (it fails).
- Change the second parameter of each assert.equal() so that the test succeeds
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('conversion', t => {
-  assert.equal(Boolean(5), '???');
-  assert.equal(Number('7'), '???');
-  assert.equal(String(21), '???');
-});
--- a/quiz/exercises/values/instanceof_exrc.mjs
+++ b/quiz/exercises/values/instanceof_exrc.mjs
-/* npm t exercises/values/instanceof_exrc.mjs
-Instructions:
- Run this test (it fails).
- Change the second parameters of assert.equal() so that the test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('instanceof', t => {
-  assert.equal('abc' instanceof String, '???');
-  assert.equal(null instanceof Object, '???');
-  assert.equal(undefined instanceof Object, '???');
-  assert.equal([true, false] instanceof Array, '???');
-  assert.equal([true, false] instanceof Object, '???');
-  assert.equal({} instanceof Object, '???');
-});
--- a/quiz/exercises/values/is_object.mjs
+++ b/quiz/exercises/values/is_object.mjs
-// Function is exported so that the test can import it
-export function isObject(x) {
-  // Use the following patterns (instead of `true`):
-  // x === null
-  // x !== undefined
-  // typeof x === 'number'
-  // typeof x !== 'object'
-  // x === 3 || x === 4  // logical OR
-  // x !== 3 && x !== 4  // logical AND
-  return true;
-}
--- a/quiz/exercises/values/is_object_test.mjs
+++ b/quiz/exercises/values/is_object_test.mjs
-/* npm t exercises/values/is_object_test.mjs
-Instructions:
- Run the test (fails).
- Change is_object.mjs so that the test passes.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-import {isObject} from './is_object.mjs';
-test('isObject', t => {
-  assert.equal(isObject(undefined), false);
-  assert.equal(isObject(null), false);
-  assert.equal(isObject(true), false);
-  assert.equal(isObject(123), false);
-  assert.equal(isObject('abc'), false);
-  assert.equal(isObject(function () {}), true);
-  assert.equal(isObject({}), true);
-  assert.equal(isObject([]), true);
-});
--- a/quiz/exercises/values/typeof_exrc.mjs
+++ b/quiz/exercises/values/typeof_exrc.mjs
-/* npm t exercises/values/typeof_exrc.mjs
-Instructions:
- Run this test (it fails).
- Change the second parameter of each assert.equal() so that the test passes
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('typeof', t => {
-  assert.equal(typeof null, '???');
-  assert.equal(typeof undefined, '???');
-  assert.equal(typeof 123, '???');
-  assert.equal(typeof 'a', '???');
-  assert.equal(typeof "abc", '???');
-  assert.equal(typeof {}, '???');
-  assert.equal(typeof function () {}, '???');
-  assert.equal(typeof [], '???');
-});
--- a/quiz/exercises/variables-assignment/const_exrc.mjs
+++ b/quiz/exercises/variables-assignment/const_exrc.mjs
-/* npm t exercises/variables-assignment/const_exrc.mjs
-Instructions:
- Run this test (it fails).
- Insert a single(!) const statement so that the test passes.
-*/
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('const', t => {
-    const x = 3;
-    assert.equal(x, 3);
-    {
-        assert.equal(x, 12);
-    }
-    assert.equal(x, 3);
-});
--- a/quiz/installation_test.mjs
+++ b/quiz/installation_test.mjs
-// npm t installation_test.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-const MIN_VERSION = [12, 2, 0];
-function greaterOrEqual(numArr1, numArr2) {
-  const maxLen = Math.max(numArr1.length, numArr2.length);
-  for (let i=0; i<maxLen; i++) {
-    // Missing parts are considered to be zero.
-    let num1 = numArr1[i] || 0;
-    let num2 = numArr2[i] || 0;
-    if (num1 < num2) {
-      return false;
-    }
-    if (num1 > num2) {
-      return true;
-    }
-  }
-  // The arrays are “equal”
-  return true
-}
-test('Do assertions work?', t => {
-  // Assert something simple
-  assert.equal(1+1, 2);
-});
-test('Does greaterOrEqual() work?', () => {
-  assert.equal(greaterOrEqual([1,2,3], [1,2]), true);
-  assert.equal(greaterOrEqual([1,2], [1,2,3]), false);
-  assert.equal(greaterOrEqual([4,0,5], [4,0,4]), true);
-  assert.equal(greaterOrEqual([4,0,5], [4,0,5]), true);
-  assert.equal(greaterOrEqual([4,0,5], [4,0,6]), false);
-  assert.equal(greaterOrEqual([4,0,5], [3,0,0]), true);
-  assert.equal(greaterOrEqual([4,0,5], [5,0,0]), false);
-});
-test(`Is Node.js version at least ${MIN_VERSION.join('.')}?`, () => {
-  const installedVersionStr = process.versions.node;
-  const installedVersion = installedVersionStr.split('.').map(str => Number(str));
-  assert.ok(greaterOrEqual(installedVersion, MIN_VERSION),
-    `Please use Node.js ${MIN_VERSION.join('.')} or later. Installed version: ${installedVersionStr}`);
-});
--- a/quiz/package-lock.json
+++ b/quiz/package-lock.json
--- a/quiz/package.json
+++ b/quiz/package.json
-{
-  "name": "js-foundations-code",
-  "version": "1.0.0",
-  "private": true,
-  "scripts": {
-    "test": "ava --match \"!*#bonus\"",
-    "testone": "ava",
-    "testall": "ava \"{exercises,demos}/**/*{_test,_exrc}.mjs\"",
-    "serve": "http-server test_data/"
-  },
-  "author": "Axel Rauschmayer",
-  "// dependencies": [
-    "http-server is needed for fetch_json_test.mjs and fetch_json_test2.mjs",
-    "isomorphic-fetch is needed for fetch_json_test.mjs and fetch_json_test2.mjs"
-  ],
-  "dependencies": {
-    "ava": "^2.0.0",
-    "esm": "^3.2.18",
-    "http-server": "^0.11.1",
-    "isomorphic-fetch": "^2.2.1"
-  },
-  "// ava": [
-    "failWithoutAssertions must be false, because assert.* is not tracked by AVA",
-    "esm completely replaces Babel, which is switched off via babel:false and compileEnhancements:false"
-  ],
-  "ava": {
-    "babel": false,
-    "compileEnhancements": false,
-    "extensions": [
-      "mjs"
-    ],
-    "require": [
-      "esm"
-    ],
-    "failWithoutAssertions": false
-  }
-}
--- a/quiz/solutions/booleans/default_via_or_exrc.mjs
+++ b/quiz/solutions/booleans/default_via_or_exrc.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-function getFilename(options) {
-    return options.filename || 'Untitled';
-}
-test('Default via ||', t => {
-    assert.equal(getFilename({}), 'Untitled'); // empty object
-    assert.equal(getFilename({filename: 'foo.txt'}), 'foo.txt');
-});
--- a/quiz/solutions/booleans/truthiness_exrc.mjs
+++ b/quiz/solutions/booleans/truthiness_exrc.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('truthiness', t => {
-  assert.equal(Boolean(null), false);
-  assert.equal(Boolean(undefined), false);
-  assert.equal(Boolean(''), false);
-  assert.equal(Boolean('abc'), true);
-  assert.equal(Boolean(0), false);
-  assert.equal(Boolean(123), true);
-  assert.equal(Boolean({}), true);
-  assert.equal(Boolean([]), true);
-});
--- a/quiz/solutions/callables/named_parameters.mjs
+++ b/quiz/solutions/callables/named_parameters.mjs
-export function handleNamedParameters(
-        { x=0, y=0, color='black' } = {}) {
-    return [x, y, color];
-}
--- a/quiz/solutions/callables/positional_parameters.mjs
+++ b/quiz/solutions/callables/positional_parameters.mjs
-export function twoParametersWithDefaultValues(x=0, y=0) {
-  return [x, y];
-}
-export function restParameters(x, ...rest) {
-  return rest;
-}
\ No newline at end of file
--- a/quiz/solutions/control-flow/array_to_string.mjs
+++ b/quiz/solutions/control-flow/array_to_string.mjs
-export function arrayToString(arr) {
-  let result = '';
-  for (const [index, elem] of arr.entries()) {
-    if (index > 0) {
-      result += '\n';
-    }
-    result += (index+1) + '. ' + elem;
-  }
-  return result;
-}
\ No newline at end of file
--- a/quiz/solutions/control-flow/is_object_via_switch.mjs
+++ b/quiz/solutions/control-flow/is_object_via_switch.mjs
-export function isObject(value) {
-  switch (typeof value) {
-    case 'object':
-    case 'function':
-      return value !== null;
-    default:
-      return false;
-  }
-}
--- a/quiz/solutions/control-flow/number_to_month.mjs
+++ b/quiz/solutions/control-flow/number_to_month.mjs
-export function numberToMonth(num) {
-  switch (num) {
-    case 1:
-      return 'January';
-    case 2:
-      return 'February';
-    case 3:
-      return 'March';
-    case 4:
-      return 'April';
-    case 5:
-      return 'May';
-    case 6:
-      return 'June';
-    case 7:
-      return 'July';
-    case 8:
-      return 'August';
-    case 9:
-      return 'September';
-    case 10:
-      return 'October';
-    case 11:
-      return 'November';
-    case 12:
-      return 'December';
-    default:
-      throw new Error('Unknown number: ' + num);
-  }
-}
--- a/quiz/solutions/exception-handling/call_function.mjs
+++ b/quiz/solutions/exception-handling/call_function.mjs
-export function callFunction(func) {
-  try {
-    const result = func();
-    return {
-      success: result,
-    };      
-  }
-  catch (err) {
-    return {
-      failure: err,
-    };
-  }
-}
\ No newline at end of file
--- a/quiz/solutions/modules/export_default.mjs
+++ b/quiz/solutions/modules/export_default.mjs
-export default function func() {
-    return 'hello';
-}
\ No newline at end of file
--- a/quiz/solutions/modules/export_named.mjs
+++ b/quiz/solutions/modules/export_named.mjs
-export function func() {
-    return 'hello';
-}
\ No newline at end of file
--- a/quiz/solutions/numbers-math/find_max.mjs
+++ b/quiz/solutions/numbers-math/find_max.mjs
-export function findMax(numbers) {
-    let max = -Infinity;
-    for (const n of numbers) {
-        if (n > max) max = n;
-    }
-    return max;
-}
--- a/quiz/solutions/numbers-math/is_odd.mjs
+++ b/quiz/solutions/numbers-math/is_odd.mjs
-export function isOdd(n) {
-    return Math.abs(n % 2) === 1;
-}
\ No newline at end of file
--- a/quiz/solutions/numbers-math/is_safe_integer.mjs
+++ b/quiz/solutions/numbers-math/is_safe_integer.mjs
-export function isSafeInteger(n) {
-  return (typeof n === 'number' // Is n a number?
-    && Math.trunc(n) === n // Is n an integer?
-    && Number.MIN_SAFE_INTEGER <= n
-    && n <= Number.MAX_SAFE_INTEGER);
-}
--- a/quiz/solutions/numbers-math/parse_number.mjs
+++ b/quiz/solutions/numbers-math/parse_number.mjs
-export function parseNumber(str) {
-  return Number(str);
-}
\ No newline at end of file
--- a/quiz/solutions/proto-chains-classes/color_point_class.mjs
+++ b/quiz/solutions/proto-chains-classes/color_point_class.mjs
-import {Point} from './point_class.mjs';
-export class ColorPoint extends Point {
-  constructor(x, y, color) {
-    super(x, y);
-    this.color = color;
-  }
-  toString() {
-    return super.toString() + ' in ' + this.color;
-  }
-}
--- a/quiz/solutions/proto-chains-classes/point_class.mjs
+++ b/quiz/solutions/proto-chains-classes/point_class.mjs
-export class Point {
-  constructor(x, y) {
-    this.x = x;
-    this.y = y;
-  }
-  dist() {
-    return Math.sqrt(this.x**2 + this.y**2);
-  }
-  toString() {
-    return `(${this.x}, ${this.y})`;
-  }
-}
--- a/quiz/solutions/proto-chains-classes/string_builder_symbol.mjs
+++ b/quiz/solutions/proto-chains-classes/string_builder_symbol.mjs
-const data = Symbol('data');
-export class StringBuilder {
-  constructor() {
-    this[data] = '';
-  }
-  add(str) {
-    this[data] += str;
-    return this;
-  }
-  toString() {
-    return this[data];
-  }
-}
--- a/quiz/solutions/quizzes-exercises/first_module.mjs
+++ b/quiz/solutions/quizzes-exercises/first_module.mjs
-// We export a function so that the test can import it
-export function hello(x) {
-  return 'Hello ' + x + '!';
-}
--- a/quiz/solutions/single-objects/color_point_object.mjs
+++ b/quiz/solutions/single-objects/color_point_object.mjs
-export const colorPoint = {
-  x: 3,
-  y: 5,
-  dist() {
-    return Math.sqrt(this.x ** 2 + this.y ** 2);
-  },
-  toString() {
-    return `(${this.x}, ${this.y})`;
-  },
-};
--- a/quiz/solutions/single-objects/find_key.mjs
+++ b/quiz/solutions/single-objects/find_key.mjs
-export function findKey(object, callback) {
-  for (const [key, value] of Object.entries(object)) {
-    if (callback(value, key, object)) {
-      return key;
-    }
-  }
-  return undefined;
-}
--- a/quiz/solutions/single-objects/method_extraction_exrc.mjs
+++ b/quiz/solutions/single-objects/method_extraction_exrc.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-const jane = {
-  first: 'Jane',
-  describe() {
-    return `Person named ${this.first}`;
-  },
-};
-test('method_extraction_exrc', t => {
-  const func = jane.describe.bind(jane);
-  assert.equal(func(), 'Person named Jane');
-  jane.first = 'John';
-  assert.equal(func(), 'Person named John');
-});
--- a/quiz/solutions/single-objects/omit_properties.mjs
+++ b/quiz/solutions/single-objects/omit_properties.mjs
-export function omitProperties(object, ...keys) {
-  const filteredEntries = Object.entries(object)
-    .filter(entry => !keys.includes(entry[0]));
-  return Object.fromEntries(filteredEntries);
-}
--- a/quiz/solutions/single-objects/simple_dict.mjs
+++ b/quiz/solutions/single-objects/simple_dict.mjs
-export function createDict() {
-  return Object.create(null);
-}
-export function setValue(dict, key, value) {
-  dict[key] = value;
-}
-export function getValue(dict, key) {
-  return dict[key];
-}
-export function hasKey(dict, key) {
-  return key in dict;
-}
-export function getKeys(dict) {
-  return Object.keys(dict);
-}
\ No newline at end of file
--- a/quiz/solutions/single-objects/update_name.mjs
+++ b/quiz/solutions/single-objects/update_name.mjs
-export function updateName(obj, name) {
-  return {...obj, name};
-}
\ No newline at end of file
--- a/quiz/solutions/single-objects/update_property.mjs
+++ b/quiz/solutions/single-objects/update_property.mjs
-export function updateProperty(obj, key, value) {
-  return { ...obj, [key]: value };
-}
\ No newline at end of file
--- a/quiz/solutions/strings/concat_string_array.mjs
+++ b/quiz/solutions/strings/concat_string_array.mjs
-export function concatStringArray(stringArray) {
-  let result = '';
-  for (const str of stringArray) {
-    result += str;
-  }
-  return result;
-}
\ No newline at end of file
--- a/quiz/solutions/strings/remove_extension.mjs
+++ b/quiz/solutions/strings/remove_extension.mjs
-export function removeExtension(str) {
-    const dotIndex = str.lastIndexOf('.');
-    if (dotIndex < 0) return str;
-    return str.slice(0, dotIndex);
-}
\ No newline at end of file
--- a/quiz/solutions/symbols/has_instance.mjs
+++ b/quiz/solutions/symbols/has_instance.mjs
-export class PrimitiveString {
-  static [Symbol.hasInstance](x) {
-    return typeof x === 'string';
-  }
-}
\ No newline at end of file
--- a/quiz/solutions/symbols/to_string_tag.mjs
+++ b/quiz/solutions/symbols/to_string_tag.mjs
-export const SPECIAL_OBJECT = {
-  [Symbol.toStringTag]: 'Hello',
-};
\ No newline at end of file
--- a/quiz/solutions/template-literals/templating.mjs
+++ b/quiz/solutions/template-literals/templating.mjs
-export const arrayWithObjectsToTable = (persons) =>
-`<table>
-${persons.map(
-  ({last,first}) =>
-    `  <tr><td>${last}</td><td>${first}</td></tr>`)
-  .join('\n')}
-</table>`;
-//---------- Bonus
-export const arrayToUnorderedListWithEscaping = (items) =>
-`<ul>
-${items.map(item => `  <li>${escapeHtml(item)}</li>`).join('\n')}
-</ul>`;
-function escapeHtml(str) {
-  return str.replace(/&/g, '&amp;') // first!
-            .replace(/>/g, '&gt;')
-            .replace(/</g, '&lt;')
-            .replace(/"/g, '&quot;')
-            .replace(/'/g, '&#39;')
-            .replace(/`/g, '&#96;');
-}
\ No newline at end of file
--- a/quiz/solutions/values/conversion_exrc.mjs
+++ b/quiz/solutions/values/conversion_exrc.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('conversion', t => {
-  assert.equal(Boolean(5), true);
-  assert.equal(Number('7'), 7);
-  assert.equal(String(21), '21');
-});
--- a/quiz/solutions/values/instanceof_exrc.mjs
+++ b/quiz/solutions/values/instanceof_exrc.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('instanceof', t => {
-  assert.equal('abc' instanceof String, false);
-  assert.equal(null instanceof Object, false);
-  assert.equal(undefined instanceof Object, false);
-  assert.equal([true, false] instanceof Array, true);
-  assert.equal([true, false] instanceof Object, true);
-  assert.equal({} instanceof Object, true);
-});
--- a/quiz/solutions/values/is_object.mjs
+++ b/quiz/solutions/values/is_object.mjs
-export function isObject(x) {
-  return x !== null && (typeof x === 'object' || typeof x === 'function');
-}
--- a/quiz/solutions/values/typeof_exrc.mjs
+++ b/quiz/solutions/values/typeof_exrc.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('typeof', t => {
-  assert.equal(typeof null, 'object');
-  assert.equal(typeof undefined, 'undefined');
-  assert.equal(typeof 123, 'number');
-  assert.equal(typeof 'a', 'string');
-  assert.equal(typeof "abc", 'string');
-  assert.equal(typeof {}, 'object');
-  assert.equal(typeof function () {}, 'function');
-  assert.equal(typeof [], 'object');
-});
--- a/quiz/solutions/variables-assignment/const_exrc.mjs
+++ b/quiz/solutions/variables-assignment/const_exrc.mjs
-import test from 'ava';
-import {strict as assert} from 'assert';
-test('const', t => {
-    const x = 3;
-    assert.equal(x, 3);
-    {
-        const x = 12;
-        assert.equal(x, 12);
-    }
-    assert.equal(x, 3);
-});
--- a/quiz/test_data/bond.json
+++ b/quiz/test_data/bond.json
-{
-  "first": "Jane",
-  "last": "Bond"
-}
\ No newline at end of file