* update array polyfills.

src/js/array.js

 /* ========================================================================
  * ZUI: array.js
- * Array Polyfill.
+ * Array polyfills.
  * http://zui.sexy
  * ========================================================================
  * Copyright (c) 2014-2016 cnezsoft.com; Licensed MIT
@@ -203,6 +203,96 @@
         };
     }
 
+    // https://tc39.github.io/ecma262/#sec-array.prototype.find
+    if (!Array.prototype.find) {
+        Object.defineProperty(Array.prototype, 'find', {
+            value: function (predicate) {
+                // 1. Let O be ? ToObject(this value).
+                if (this == null) {
+                    throw new TypeError('"this" is null or not defined');
+                }
+
+                var o = Object(this);
+
+                // 2. Let len be ? ToLength(? Get(O, "length")).
+                var len = o.length >>> 0;
+
+                // 3. If IsCallable(predicate) is false, throw a TypeError exception.
+                if (typeof predicate !== 'function') {
+                    throw new TypeError('predicate must be a function');
+                }
+
+                // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
+                var thisArg = arguments[1];
+
+                // 5. Let k be 0.
+                var k = 0;
+
+                // 6. Repeat, while k < len
+                while (k < len) {
+                    // a. Let Pk be ! ToString(k).
+                    // b. Let kValue be ? Get(O, Pk).
+                    // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
+                    // d. If testResult is true, return kValue.
+                    var kValue = o[k];
+                    if (predicate.call(thisArg, kValue, k, o)) {
+                        return kValue;
+                    }
+                    // e. Increase k by 1.
+                    k++;
+                }
+
+                // 7. Return undefined.
+                return undefined;
+            }
+        });
+    }
+
+    // https://tc39.github.io/ecma262/#sec-array.prototype.findIndex
+    if (!Array.prototype.findIndex) {
+        Object.defineProperty(Array.prototype, 'findIndex', {
+            value: function (predicate) {
+                // 1. Let O be ? ToObject(this value).
+                if (this == null) {
+                    throw new TypeError('"this" is null or not defined');
+                }
+
+                var o = Object(this);
+
+                // 2. Let len be ? ToLength(? Get(O, "length")).
+                var len = o.length >>> 0;
+
+                // 3. If IsCallable(predicate) is false, throw a TypeError exception.
+                if (typeof predicate !== 'function') {
+                    throw new TypeError('predicate must be a function');
+                }
+
+                // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
+                var thisArg = arguments[1];
+
+                // 5. Let k be 0.
+                var k = 0;
+
+                // 6. Repeat, while k < len
+                while (k < len) {
+                    // a. Let Pk be ! ToString(k).
+                    // b. Let kValue be ? Get(O, Pk).
+                    // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
+                    // d. If testResult is true, return k.
+                    var kValue = o[k];
+                    if (predicate.call(thisArg, kValue, k, o)) {
+                        return k;
+                    }
+                    // e. Increase k by 1.
+                    k++;
+                }
+
+                // 7. Return -1.
+                return -1;
+            }
+        });
+    }
+
     /**
      * Returns true if at least one element in this array satisfies the provided testing conditions.
      * @param  {function or plain object}  conditions