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55 lines
1.4 KiB
55 lines
1.4 KiB
8 years ago
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if (!Array.prototype.findIndex) {
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Object.defineProperty(Array.prototype, 'findIndex', {
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value: function(predicate) {
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'use strict';
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if (this == null) {
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throw new TypeError('Array.prototype.findIndex called on null or undefined');
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}
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if (typeof predicate !== 'function') {
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throw new TypeError('predicate must be a function');
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}
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var list = Object(this);
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var length = list.length >>> 0;
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var thisArg = arguments[1];
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var value;
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for (var i = 0; i < length; i++) {
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value = list[i];
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if (predicate.call(thisArg, value, i, list)) {
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return i;
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}
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}
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return -1;
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},
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enumerable: false,
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configurable: false,
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writable: false
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});
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}
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if (!Array.prototype.find) {
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Object.defineProperty(Array.prototype, 'find', {
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value: function(predicate) {
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'use strict';
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if (this == null) {
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throw new TypeError('Array.prototype.find called on null or undefined');
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}
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if (typeof predicate !== 'function') {
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throw new TypeError('predicate must be a function');
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}
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var list = Object(this);
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var length = list.length >>> 0;
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var thisArg = arguments[1];
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var value;
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for (var i = 0; i < length; i++) {
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value = list[i];
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if (predicate.call(thisArg, value, i, list)) {
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return value;
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}
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}
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return undefined;
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}
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});
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}
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