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Array prototype every polyfill *** MDN => https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every ***
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| if (!Array.prototype.every) { | |
| Array.prototype.every = function(callbackfn, thisArg) { | |
| 'use strict'; | |
| var T, k; | |
| if (this == null) { | |
| throw new TypeError('this is null or not defined'); | |
| } | |
| // 1. Let O be the result of calling ToObject passing the this | |
| // value as the argument. | |
| var O = Object(this); | |
| // 2. Let lenValue be the result of calling the Get internal method | |
| // of O with the argument "length". | |
| // 3. Let len be ToUint32(lenValue). | |
| var len = O.length >>> 0; | |
| // 4. If IsCallable(callbackfn) is false, throw a TypeError exception. | |
| if (typeof callbackfn !== 'function') { | |
| throw new TypeError(); | |
| } | |
| // 5. If thisArg was supplied, let T be thisArg; else let T be undefined. | |
| if (arguments.length > 1) { | |
| T = thisArg; | |
| } | |
| // 6. Let k be 0. | |
| k = 0; | |
| // 7. Repeat, while k < len | |
| while (k < len) { | |
| var kValue; | |
| // a. Let Pk be ToString(k). | |
| // This is implicit for LHS operands of the in operator | |
| // b. Let kPresent be the result of calling the HasProperty internal | |
| // method of O with argument Pk. | |
| // This step can be combined with c | |
| // c. If kPresent is true, then | |
| if (k in O) { | |
| // i. Let kValue be the result of calling the Get internal method | |
| // of O with argument Pk. | |
| kValue = O[k]; | |
| // ii. Let testResult be the result of calling the Call internal method | |
| // of callbackfn with T as the this value and argument list | |
| // containing kValue, k, and O. | |
| var testResult = callbackfn.call(T, kValue, k, O); | |
| // iii. If ToBoolean(testResult) is false, return false. | |
| if (!testResult) { | |
| return false; | |
| } | |
| } | |
| k++; | |
| } | |
| return true; | |
| }; | |
| } |
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