Array.uts

import { describe, test, expect, Result } from './tests.uts'



export function testArray() : Result {
  return describe("Array", () => {

    test('constructor', () => {
      // 构造器测试
      // #TEST Array.Constructor
      let a1 = [1, 2, 3]
      let a2 = [1, '2', 3]
      console.log(a1) //[1, 2, 3]
      console.log(a2) // [1, '2', 3]
      // #END
      expect(a1).toEqual([1, 2, 3]);
      expect(a2).toEqual([1, '2', 3]);
      let a3 = new Array(1, 2, 3);

      // swift 中字面量创建数组，仅支持同一类型的元素
      // #ifndef APP-IOS
      expect(a3).toEqual(new Array(1, 2, 3));
      let a4 = new Array<any>(1, '2', 3);
      expect(a4).toEqual(new Array<any>(1, '2', 3));
      let a5 = Array(1, 2, 3);
      expect(a5).toEqual(Array(1, 2, 3));
      let a6 = Array<any>(1, '2', '3')
      expect(a6).toEqual(Array<any>(1, '2', '3'));
      // #endif

    })

    test('equals', () => {
      // 构造器测试
      let a1 = [1, 2, 3]
      let a2 = [1, 2, 3]
      let equalsRet = (a1 == a2)
      console.log(equalsRet)
      // #ifndef APP-IOS
      expect(equalsRet).toEqual(false);
      // #endif
      // #ifdef APP-IOS
      expect(equalsRet).toEqual(true);
      // #endif


    })

    test('convert-native', () => {
      // #TEST Array.toKotlinList
      // #ifdef APP-ANDROID
      let utsArray = ["1", 2, 3.0]
      let javaArray = utsArray.toTypedArray();
      let kotlinArray = utsArray.toKotlinList()

      let convertArrayFromJava = Array.fromNative(javaArray);
      let convertArrayFromKotlin = Array.fromNative(kotlinArray);
      console.log(convertArrayFromJava[0] == convertArrayFromKotlin[0])//true

      console.log(convertArrayFromJava[0])//"1"
      // #END
      expect(convertArrayFromJava[0] == convertArrayFromKotlin[0]).toEqual(true);
      expect(convertArrayFromJava[0]).toEqual("1");
      // #endif

    })

    test('length', () => {
      // #TEST Array.length
      const arr = ['shoes', 'shirts', 'socks', 'sweaters'];
      console.log(arr.length)//4
      console.log(arr[1])//'shoes'
      console.log(arr[1])//'shirts'
      // #END
      // expect(arr[4]).toEqual(null);
      const numbers : number[] = [1, 2, 3, 4, 5];
      if (numbers.length > 3) {
        numbers.length = 3;
      }
      expect(numbers.length).toEqual(3);
      expect(numbers).toEqual([1, 2, 3]);
      expect([].length).toEqual(0);

      // 1. web: 最大长度 2^32-1
      // 超出边界报错: RangeError: Invalid array length
      // 2. kotlin: 最大长度 2^31-1
      // 超出边界报错: Error: targetMethod error::java.lang.OutOfMemoryError: Failed to allocate a 420546432 byte allocation with 6291456 free bytes and 300MB until OOM, target footprint 295113520, growth limit 603979776
      // 3. swift: 最大长度和内存有关
      // 超出边界没有返回信息
    })
    test("concat", () => {
      // #TEST Array.concat,Array.concat_1
      let ret = ['a', 'b', 'c'].concat(['d', 'e', 'f'])
      console.log(ret) //["a", "b", "c", "d", "e", "f"]
      let ret1 = [1, 2, 3].concat([4, 5, 6])
      console.log(ret1)//[1, 2, 3, 4, 5, 6]
      let ret2 = [''].concat([''])//
      console.log(ret2)//["", ""]

      const num1 = [1, 2, 3];
      const num2 = [4, 5, 6];
      const num3 = [7, 8, 9];
      const numbers = num1.concat(num2, num3);
      console.log(numbers)//[1, 2, 3, 4, 5, 6, 7, 8, 9]
      // #END

      expect(numbers).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9]);
      expect(ret).toEqual(["a", "b", "c", "d", "e", "f"]);
      expect(ret1).toEqual([1, 2, 3, 4, 5, 6]);
      expect(ret2).toEqual(["", ""]);

    })
    test("copyWithin", () => {
      // #TEST Array.copyWithin
      const arr = ['a', 'b', 'c', 'd', 'e'];
      let ret1 = arr.copyWithin(0, 3, 4)
      console.log(ret1)//["d", "b", "c", "d", "e"]
      // #END
      expect(ret1).toEqual(["d", "b", "c", "d", "e"]);
      expect(arr.copyWithin(1, 3)).toEqual(["d", "d", "e", "d", "e"]);
      const arr2 = [1, 2, 3, 4, 5];
      expect(arr2.copyWithin(-2)).toEqual([1, 2, 3, 1, 2]);
      expect(arr2.copyWithin(-2, -3, -1)).toEqual([1, 2, 3, 3, 1]);
    })
    test("every", () => {
      // #TEST Array.every,Array.every_1,Array.every_2,Array.every_3
      const isBelowThreshold = (currentValue : number) : boolean => currentValue < 40;
      const array1 : number[] = [1, 30, 39, 29, 10, 13];
      console.log(array1.every(isBelowThreshold));// true

      const array2 : number[] = [1, 30, 39, 29, 10, 13, 41];
      console.log(array2.every(isBelowThreshold));// false

      const array3 : number[] = [1, 2, 3];
      array3.every((element : number, index : number, array : number[]) : boolean => {
        console.log(array[index])//1=>2->3
        return true;
      })

      // #END
      array3.every((element : number, index : number, array : number[]) : boolean => {
        expect(array[index]).toEqual(element);
        return true;
      })
      expect(array1.every(isBelowThreshold)).toEqual(true);
      expect(array2.every(isBelowThreshold)).toEqual(false);
    })
    test("fill", () => {
      // #TEST Array.fill
      const array1 : number[] = [1, 2, 3, 4];
      let ret1 = array1.fill(0, 2, 4)
      console.log(ret1); //[1, 2, 0, 0]
      // #END
      expect(ret1).toEqual([1, 2, 0, 0]);
      expect(array1.fill(5, 1)).toEqual([1, 5, 5, 5]);
      expect(array1.fill(6)).toEqual([6, 6, 6, 6]);
      const array2 : number[] = [1, 2, 3]
      expect(array2.fill(4)).toEqual([4, 4, 4]);
      const array3 : number[] = [0, 0]
      expect(array3.fill(1, null)).toEqual([1, 1]);
      expect(array3.fill(1, 0, 1.5)).toEqual([1, 1]);
    })
    test("filter", () => {
      // #TEST Array.filter,Array.filter_1,Array.filter_2,Array.filter_3
      const words : string[] = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];
      const result = words.filter((word : string) : boolean => word.length > 6);
      console.log(result);// ["exuberant", "destruction", "present"]

      const array1 : number[] = [-3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13];
      const isPrime = array1.filter((num : number) : boolean => {
        for (let i = 2; num > i; i++) {
          // swift里，基础类型暂不支持!==,===对比
          if (num % i == 0) {
            return false;
          }
        }
        return num > 1;
      })
      console.log(isPrime)//[2, 3, 5, 7, 11, 13]

      const array2 : number[] = [1, 2, 3];
      array2.filter((element : number, index : number, array : number[]) : boolean => {
        console.log(array[index])//1=>2=>3
        return true;
      })
      // #END
      array2.filter((element : number, index : number, array : number[]) : boolean => {
        expect(array[index]).toEqual(element);
        return true;
      })
      expect(result).toEqual(["exuberant", "destruction", "present"]);
      expect(isPrime).toEqual([2, 3, 5, 7, 11, 13]);
    })
    test("find", () => {
      // #TEST Array.find_2
      const array1 : number[] = [5, 12, 8, 130, 44];
      const found1 = array1.find((element : number) : boolean => element > 10);
      console.log(found1) //12
      // #END
      expect(found1).toEqual(12);
      // #TEST Array.find_1
      const array3 : number[] = [5, 12, 8, 130, 44];
      const found2 = array3.find((element : number, index : number) : boolean => element < 5);
      console.log(found2) // null
      // #END
      expect(found2).toEqual(null);
      // #TEST Array.find
      let array2 : number[] = [1, 2, 3];
      array2.find((element : number, index : number, array : number[]) : boolean => {
        console.log(array[index]) //1=>2=>3
        return true;
      })
      // #END
      array2 = [1, 2, 3];
      array2.find((element : number, index : number, array : number[]) : boolean => {
        expect(array[index]).toEqual(element);
        return true;
      })
    })
    test("findIndex", () => {
      // #TEST Array.findIndex_1,Array.findIndex_2,Array.findIndex
      const array1 : number[] = [5, 12, 8, 130, 44];
      let isLargeNumber = (element : number, index : number) : boolean => element > 13;
      console.log(isLargeNumber)//3

      const array2 : number[] = [10, 11, 12];
      console.log(array2.findIndex(isLargeNumber))//3

      const array3 : number[] = [1, 2, 3];
      array3.findIndex((element : number, index : number, array : number[]) : boolean => {
        console.log(array[index]) //1=>2=>3
        return true;
      })
      // #END
      expect(array2.findIndex(isLargeNumber)).toEqual(-1);
      expect(array1.findIndex(isLargeNumber)).toEqual(3);
      array3.findIndex((element : number, index : number, array : number[]) : boolean => {
        expect(array[index]).toEqual(element);
        return true;
      })
    })
    test("flat", () => {
      const arr1 : any[] = [0, 1, 2, [3, 4]];
      expect(arr1.flat()).toEqual([0, 1, 2, 3, 4]);
      const arr2 : any[] = [0, 1, 2, [[[3, 4]]]];
      expect(arr2.flat(2)).toEqual([0, 1, 2, [3, 4]]);
      const arr3 : any[] = [1, 2, [3, 4, [5, 6]]];
      expect(arr3.flat(2)).toEqual([1, 2, 3, 4, 5, 6]);
    })
    test("forEach", () => {
      // #TEST Array.forEach,Array.forEach_1,Array.forEach_2
      const array1 : string[] = ['a', 'b', 'c'];
      array1.forEach(element => console.log(element));
      // expected output: "a"
      // expected output: "b"
      // expected output: "c"
      const items : string[] = ['item1', 'item2', 'item3'];
      const copyItems : string[] = [];
      items.forEach((item : string) => {
        copyItems.push(item);
      });
      console.log(copyItems)//['item1', 'item2', 'item3']
      // #END
      array1.forEach((element : string, index : number) => {
        expect(array1[index]).toEqual(element)
      });
      expect(copyItems).toEqual(items)
    })
    test("includes", () => {
      // #TEST Array.includes
      const array1 : number[] = [1, 2, 3];
      console.log(array1.includes(2))//true
      // #END
      expect(array1.includes(2)).toEqual(true);
      const pets : string[] = ['cat', 'dog', 'bat'];
      expect(pets.includes('cat')).toEqual(true);
      expect(pets.includes('at')).toEqual(false);
      const array2 : string[] = ['a', 'b', 'c'];
      expect(array2.includes('c', 3)).toEqual(false);
      expect(array2.includes('c', 100)).toEqual(false);

      type P = {
        x : number
        y : number
      }

      // #ifndef APP-IOS
      const s = JSON.parse<P[]>(JSON.stringify([{ x: 0, y: 0 }])) as P[]
      s[0].x += 0;
      const clearList = s.map((v : P, _, _a) : number => v.x)
      expect(clearList.includes(0)).toEqual(true);
      // #endif
      // #ifdef APP-IOS
      const s = JSON.parse<P[]>(JSON.stringify([{ x: 0, y: 0 }])!) as P[]
      s[0].x += 0;
      const clearList = s.map((v : P, index : number, _a) : number => v.x)
      expect(clearList.includes(0)).toEqual(true);
      // #endif

    })
    
    test("of-1", () => {
      let a1 = Array.of('foo', 2, 'bar', true)
      let a2 = Array.of()
      console.log(a1,a2)
      type User = {
      	id:number
      	name:string
      }
      let u1 = {
      	id:1001,
      	name:"张三"
      } as User
      let a3 = Array.of("aaa",false,u1)
      expect(a1).toEqual([ "foo", 2, "bar", true ]);
      expect(a2).toEqual([]);
      expect(a3).toEqual([ "aaa", false, {id: 1001, name: "张三"} ] );
    })
    
    test("from", () => {
      let a1 = Array.from('foo')
      let a2 = Array.from([1, 2, 3], function(x:any|null,index:number){
        
        return (x as Number).toInt() + (x as Number).toInt()
      })
      expect(a1).toEqual(["f", "o", "o"]);
      expect(a2).toEqual([2, 4, 6]);
      let m1 = new Map<string,any>()
      m1.set("name","张三")
      m1.set("age",123)
      let a3 = Array.from(m1)
      console.log(a3)
      expect(a3).toEqual([["name","张三"],["age",123]]);
      
    })
    
    test("indexOf", () => {

      let raw = {}
      let arr = new Array<UTSJSONObject>()
      arr.push({});
      arr.push({});
      arr.push(raw);
      expect(arr.indexOf(raw)).toEqual(2);

      // #TEST Array.indexOf
      const beasts : string[] = ['ant', 'bison', 'camel', 'duck', 'bison'];

      console.log(beasts.indexOf('bison')); //  1


      console.log(beasts.indexOf('bison', 2));// 2

      console.log(beasts.indexOf('giraffe'));// -1
      // #END

      expect(beasts.indexOf('bison')).toEqual(1);
      expect(beasts.indexOf('bison', 2)).toEqual(4);
      expect(beasts.indexOf('giraffe')).toEqual(-1);

      const indices : number[] = [];
      const array : string[] = ['a', 'b', 'a', 'c', 'a', 'd'];
      const element = 'a';
      let idx = array.indexOf(element);
      // swift里，基础类型暂不支持!==,===对比
      while (idx != -1) {
        indices.push(idx);
        idx = array.indexOf(element, idx + 1);
      }
      expect(indices).toEqual([0, 2, 4]);
    })
    test("join", () => {
      // #TEST Array.join
      const elements : string[] = ['Fire', 'Air', 'Water'];
      let ret1 = elements.join()//Fire,Air,Water
      let ret2 = elements.join('') //FireAirWater
      let ret3 = elements.join('-')//Fire-Air-Water
      expect(ret1).toEqual("Fire,Air,Water");
      expect(ret2).toEqual("FireAirWater");
      expect(ret3).toEqual("Fire-Air-Water");
      // #END
    })
    test("lastIndexOf", () => {

      let raw = {}
      let arr = new Array<UTSJSONObject>()
      arr.push({});
      arr.push({});
      arr.push(raw);
      expect(arr.lastIndexOf(raw)).toEqual(2);

      // #TEST Array.lastIndexOf
      const animals : string[] = ['Dodo', 'Tiger', 'Penguin', 'Dodo'];
      console.log(animals.lastIndexOf('Dodo'));//3
      console.log(animals.lastIndexOf('Tiger'));//1
      // #END

      expect(animals.lastIndexOf('Dodo')).toEqual(3);
      expect(animals.lastIndexOf('Tiger')).toEqual(1);
      const array : number[] = [2, 5, 9, 2];
      let index = array.lastIndexOf(2);
      expect(index).toEqual(3);
      index = array.lastIndexOf(7);
      expect(index).toEqual(-1);
      index = array.lastIndexOf(2, 3);
      expect(index).toEqual(3);
      index = array.lastIndexOf(2, 2);
      expect(index).toEqual(0);




    })
    test("map", () => {
      // #TEST Array.map,Array.map_1,Array.map_2
      const array1 : number[] = [1, 4, 9, 16];
      const map1 = array1.map((x : number) : number => x * 2);
      console.log(map1);
      // expected output: Array [2, 8, 18, 32]
      const numbers : number[] = [1, 4, 9];
      const roots = numbers.map((num : number) : number => num + 1);


      const array2 : number[] = [1, 2, 3];
      array2.map((element : number, index : number, array : number[]) => {
        console.log(array[index]) //1=>2=>3
      })
      // #END
      array2.map((element : number, index : number, array : number[]) => {
        expect(array[index]).toEqual(element);
      })
      expect(map1).toEqual([2, 8, 18, 32]);
      expect(numbers).toEqual([1, 4, 9]);
      expect(roots).toEqual([2, 5, 10]);
    })
    test("pop", () => {
      // #TEST Array.pop
      const plants : string[] = ['broccoli', 'cauliflower', 'cabbage', 'kale', 'tomato'];
      let ret1 = plants.pop()
      console.log(ret1)//"tomato"
      console.log(plants)//["broccoli", "cauliflower", "cabbage", "kale"]
      // #END
      expect(ret1).toEqual("tomato");
      expect(plants).toEqual(["broccoli", "cauliflower", "cabbage", "kale"]);
      plants.pop();
      expect(plants).toEqual(["broccoli", "cauliflower", "cabbage"]);

    })
    test("push", () => {
      // #TEST Array.push
      const animals : string[] = ['pigs', 'goats', 'sheep'];
      const count = animals.push('cows');
      console.log(count)//4
      console.log(animals) //['pigs', 'goats', 'sheep', 'cows']
      // #END
      expect(count).toEqual(4);
      expect(animals).toEqual(['pigs', 'goats', 'sheep', 'cows']);
      animals.push('chickens', 'cats', 'dogs');
      expect(animals).toEqual(["pigs", "goats", "sheep", "cows", "chickens", "cats", "dogs"]);

    })
    test("reduce", () => {
      // #TEST Array.reduce,Array.reduce_1,Array.reduce_2,Array.reduce_3,Array.reduce_4,Array.reduce_5
      const array1 : number[] = [1, 2, 3, 4];
      const initialValue : number = 0;
      const sumWithInitial = array1.reduce(
        (previousValue : number, currentValue : number) : number => previousValue + currentValue,
        initialValue
      );
      console.log(sumWithInitial)//10
      // #END
      expect(sumWithInitial).toEqual(10);
    })
    test("shift", () => {
      // #TEST Array.shift
      const array1 = [1, 2, 3];

      const firstElement = array1.shift();

      console.log(array1); // [2, 3]     

      console.log(firstElement); //1
      // #END
      expect(firstElement).toEqual(1);
      expect(array1).toEqual([2, 3]);
    })
    test("slice", () => {
      // #TEST Array.slice
      const animals = ['ant', 'bison', 'camel', 'duck', 'elephant'];

      console.log(animals.slice(2));
      //  ["camel", "duck", "elephant"]

      console.log(animals.slice(2, 4));
      //["camel", "duck"]

      console.log(animals.slice(1, 5));
      //  ["bison", "camel", "duck", "elephant"]

      console.log(animals.slice(-2));
      // ["duck", "elephant"]

      console.log(animals.slice(2, -1));
      // ["camel", "duck"]

      console.log(animals.slice());
      //["ant", "bison", "camel", "duck", "elephant"]
      // #END
      expect(animals.slice(2)).toEqual(["camel", "duck", "elephant"]);
      expect(animals.slice(2, 4)).toEqual(["camel", "duck"]);
      expect(animals.slice(1, 5)).toEqual(["bison", "camel", "duck", "elephant"]);
      expect(animals.slice(-2)).toEqual(["duck", "elephant"]);
      expect(animals.slice(2, -1)).toEqual(["camel", "duck"]);
      expect(animals.slice()).toEqual(["ant", "bison", "camel", "duck", "elephant"]);
    })
    test("some", () => {
      // #TEST Array.some
      const array : number[] = [1, 2, 3, 4, 5];
      const even = (element : number) : boolean => element % 2 == 0;
      console.log(array.some(even));//true
      // #END

      expect(array.some(even)).toEqual(true);
      const isBiggerThan10 = (element : number) : boolean => element > 10;
      expect([2, 5, 8, 1, 4].some(isBiggerThan10)).toEqual(false);
      expect([12, 5, 8, 1, 4].some(isBiggerThan10)).toEqual(true);
    })
    test("splice", () => {
      // #TEST Array.splice
      const months : string[] = ['Jan', 'March', 'April', 'June'];
      months.splice(1, 0, 'Feb');
      console.log(months)//["Jan", "Feb", "March", "April", "June"]
      // #END

      expect(months).toEqual(["Jan", "Feb", "March", "April", "June"]);
      months.splice(4, 1, 'May');
      expect(months).toEqual(["Jan", "Feb", "March", "April", "May"]);
    })
    test('sort', () => {
      // #TEST Array.slice
      const months = ['March', 'Jan', 'Feb', 'Dec'];
      months.sort();
      console.log(months)//["Dec", "Feb", "Jan", "March"]
      // #END
      expect(months).toEqual(["Dec", "Feb", "Jan", "March"]);

      const array1 = [1, 30, 4, 21, 100000];
      array1.sort();
      expect(array1).toEqual([1, 100000, 21, 30, 4]);

      const array2 = [5, 1, 4, 2, 3];
      array2.sort((a, b) : number => a - b);
      expect(array2).toEqual([1, 2, 3, 4, 5]);

      // const array3 = [5, "banana", 4, "apple", 3, "cherry", 2, "date", 1];
      // array3.sort();
      // expect(array3).toEqual([1, 2, 3, 4, 5, "apple", "banana", "cherry", "date"]);

      const array4 = [
        { name: "John", age: 24 },
        { name: "Sarah", age: 19 },
        { name: "Bob", age: 27 },
        { name: "Alice", age: 21 }
      ];
      // 先强转类型，解决编译报错
      array4.sort((a, b) : number => (a['age'] as number) - (b['age'] as number));

      // #ifndef APP-IOS
      expect(array4).toEqual([{ name: "Sarah", age: 19 }, { name: "Alice", age: 21 }, { name: "John", age: 24 }, { name: "Bob", age: 27 }]);
      // #endif

      // #ifdef APP-IOS
      const arr = array4.map((value : UTSJSONObject) : number => { return value["age"] as number })
      expect(arr).toEqual([19, 21, 24, 27])
      // #endif




    })
    test("unshift", () => {
      // #TEST Array.unshift
      const array1 = [1, 2, 3];
      let ret1 = array1.unshift(4, 5)
      console.log(ret1);
      //  5

      console.log(array1);
      // [4, 5, 1, 2, 3]
      // #END
      expect(ret1).toEqual(5);
      expect(array1).toEqual([4, 5, 1, 2, 3]);
    })
    test("toString", () => {
      // #TEST Array.toString
      const array1 : number[] = [1, 2, 3];
      console.log(array1.toString()) //"1,2,3"
      // #END
      expect(array1.toString()).toEqual("1,2,3");
      const array2 = new Array<string>()
      array2.push("a")
      array2.push("b")
      array2.push("c")
      expect(array2.toString()).toEqual("a,b,c");
    })
    test('reverse', () => {
      // const array1: string[] = ['one', 'two', 'three'];
      // const reversed1: string[] = array1.reverse();
      // expect(reversed1).toEqual(["three", "two", "one"]);
      // expect(array1).toEqual(["three", "·two", "one"]);

      // const array2 = [1, 2, 3, 4, 5];
      // const reversed2 = array2.reverse();
      // expect(reversed2).toEqual([5, 4, 3, 2, 1]);
      // expect(array2).toEqual([5, 4, 3, 2, 1]);
    })
    test("reduceRight", () => {
      // #TEST Array.reduceRight,Array.reduceRight_1,Array.reduceRight_2,Array.reduceRight_3,Array.reduceRight_4,Array.reduceRight_5,Array.reduceRight_6
      const array1 : number[][] = [[0, 1], [2, 3], [4, 5]];
      const result1 = array1.reduceRight((accumulator : number[], currentValue : number[]) : number[] => accumulator.concat(currentValue));
      console.log(result1) //[4, 5, 2, 3, 0, 1]


      const array2 : number[] = [1, 2, 3, 4];
      let result2 = array2.reduceRight((acc : number, cur : number, index : number, array : number[]) : number => {
        return acc + cur;
      });

      console.log(result2) //10


      const result3 = array2.reduceRight((acc : number, cur : number) : number => acc + cur, 5);
      console.log(result3) //15
      // #END

      expect(result3).toEqual(15);
      expect(result1).toEqual([4, 5, 2, 3, 0, 1]);
      result2 = array2.reduceRight((acc : number, cur : number, index : number, array : number[]) : number => {
        expect(array[index]).toEqual(cur);
        return acc + cur;
      });
      expect(result2).toEqual(10);
    })
    test("flatMap", () => {
      const arr : number[] = [1, 2, 3];
      const result = arr.flatMap((x : number) : number[] => [x, x * 2]);
      expect(result).toEqual([1, 2, 2, 4, 3, 6]);

      const arr1 : number[] = [1, 2, 3, 4];
      const result1 = arr1.flatMap((num : number, index : number, array : number[]) : number[] => {
        expect(array[index]).toEqual(num);
        if (num % 2 == 0) {
          return [num * 2];
        }
        return [];
      });
      expect(result1).toEqual([4, 8]);
    })
    test("entries", () => {
      // const array1 = ['a', 'b', 'c'];
      // const iterator1 = array1.entries();
      // expect(iterator1.next().value).toEqual([0, "a"]);
      // expect(iterator1.next().value).toEqual([1, "b"]);
      // expect(iterator1.next().value).toEqual([2, "c"]);
      // expect(iterator1.next().done).toEqual(true);

      // const array2: any[] = [1, 2, 'hello', true, { name: 'john', age: 30 }, [4, 5]];
      // let count = 0;
      // for (const [index, element] of array2.entries()) {
      //     count++;
      //     expect(element).toEqual(array2[index]);
      // }
      // expect(count).toEqual(array2.length);
    })
    test("keys", () => {
      // const array1 = ['a', 'b', 'c'];
      // const iterator1 = array1.keys();
      // expect(iterator1.next().value).toEqual(0);
      // expect(iterator1.next().value).toEqual(1);
      // expect(iterator1.next().value).toEqual(2);
      // expect(iterator1.next().done).toEqual(true);
    })
    test("isArray", () => {
      // #TEST Array.isArray

      console.log(Array.isArray([1, 3, 5]));
      // Expected output: true

      console.log(Array.isArray('[]'));
      // Expected output: false

      console.log(Array.isArray(new Array(5)));
      // Expected output: true
      // #ifdef APP-ANDROID
      console.log(Array.isArray(new Int16Array([15, 33])));
      // #endif
      // Expected output: false
      // #END
    })
    //示例
    test("sample", () => {
      // #TEST Array.sampleCreate
      const fruits = ['Apple', 'Banana']
      console.log(fruits.length)
      // #END

      // #TEST Array.sampleVisit
      const first = fruits[0]
      console.log(first)     // Apple

      const last = fruits[fruits.length - 1]
      console.log(last) // Banana
      // #END

      // #TEST Array.sampleForEach
      fruits.forEach(function (item, index: number, array) {
        console.log(item, index)
      })
      // Apple 0
      // Banana 1
      // #END

      // #TEST Array.sampleAdd
      let newLength = fruits.push('Orange')
      // ["Apple", "Banana", "Orange"]
      console.log(newLength)//3
      // #END

      // #TEST Array.samplePop
      const lastE = fruits.pop() // remove Orange (from the end)
      // ["Apple", "Banana"]
      console.log(lastE)
      // #END

      // #TEST Array.sampleShift
      const firstE = fruits.shift() // remove Apple from the front
      console.log(firstE) // ["Banana"]
      // #END

      // #TEST Array.sampleUnshift
      newLength = fruits.unshift('Strawberry') // add to the front
      console.log(newLength) // 2
      // ["Strawberry", "Banana"]
      // #END

      // #TEST Array.sampleIndexOf
      fruits.push('Mango')
      // ["Strawberry", "Banana", "Mango"]
      let pos = fruits.indexOf('Banana')
      // 1
      // #END

      // #TEST Array.sampleSplice
      const removedItem = fruits.splice(pos, 1) // this is how to remove an item
      console.log(removedItem) // ["Banana"]

      // #END

      // #TEST Array.sampleSpliceMul
      const vegetables = ['Cabbage', 'Turnip', 'Radish', 'Carrot']
      console.log(vegetables)
      // ["Cabbage", "Turnip", "Radish", "Carrot"]
      pos = 1
      const n = 2
      const removedItems = vegetables.splice(pos, n)
      // this is how to remove items, n defines the number of items to be removed,
      // starting at the index position specified by pos and progressing toward the end of array.
      console.log(vegetables)
      // ["Cabbage", "Carrot"] (the original array is changed)
      console.log(removedItems)
      // ["Turnip", "Radish"]
      // #END

      // #TEST Array.sampleSpliceCopy
      const shallowCopy = fruits.slice() // this is how to make a copy
      console.log(shallowCopy) // ["Strawberry", "Mango"]
      // #END

      // #TEST Array.sampleForEachCallback
      let array = ['a', 'b', 'c'];
      array.forEach(element => {
        console.log(element)
        // array.pop() // 此行为在 Android 平台会造成闪退，在 iOS 平台会输出 'a', 'b', 'c', 而 JS 会输出 'a', 'b'
      });

      // 如果想让上述行为正常运行，可以用 while 循环实现：

      array = ['a', 'b', 'c'];
      let index = 0;
      while (index < array.length) {
        console.log(array[index]);
        array.pop();
        index += 1;
      }
      // #END

      // #TEST Array.sampleSort
      // #ifdef APP-ANDROID
      let a = [2, 0, 4];
      a.sort((a, b) : number => {
        // 这里的判断不能省略
        if (a.compareTo(b) == 0) {
          return 0
        }
        return a - b
      })
      // #endif

      // #END

      // #TEST Array.sampleFill
      let b = new Array<Number>()
      for (let i = 0; i < 20; i++) {
        b.push(0)
      }
      // #END

      // #TEST Array.sampleFillError
      // #ifdef APP-ANDROID
      new Array(20).fill(0)
      // #endif
      
      // #END

    })

  })
}