Created
October 24, 2016 11:27
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Array.prototype.find (polyfill)
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if (!Array.prototype.find) { | |
Array.prototype.find = function(predicate) { | |
if (this == null) { | |
throw new TypeError('Array.prototype.find 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 value; | |
} | |
} | |
return undefined; | |
}; | |
} |
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