Created
April 7, 2019 14:08
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| // Array.prototype.findIndex | |
| if (!Array.prototype.findIndex) { | |
| Array.prototype.findIndex = function(predicate) { | |
| if (this == null) { | |
| throw new TypeError('Array.prototype.findIndex called on null or undefined'); | |
| } | |
| if (typeof predicate !== 'function') { | |
| throw new TypeError('predicate must be a function'); | |
| } | |
| var list = Object(this); | |
| var length = list.length >>> 0; | |
| var thisArg = arguments[1]; | |
| var value; | |
| for (var i = 0; i < length; i++) { | |
| value = list[i]; | |
| if (predicate.call(thisArg, value, i, list)) { | |
| return i; | |
| } | |
| } | |
| return -1; | |
| }; | |
| } |
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