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34 lines
831 B
34 lines
831 B
4 years ago
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'use strict';
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var _require = require('../helpers/is'),
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isFunction = _require.isFunction;
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module.exports = function unique(key) {
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var collection = void 0;
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if (key === undefined) {
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collection = this.items.filter(function (element, index, self) {
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return self.indexOf(element) === index;
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});
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} else {
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collection = [];
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var usedKeys = [];
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for (var iterator = 0, length = this.items.length; iterator < length; iterator += 1) {
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var uniqueKey = void 0;
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if (isFunction(key)) {
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uniqueKey = key(this.items[iterator]);
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} else {
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uniqueKey = this.items[iterator][key];
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}
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if (usedKeys.indexOf(uniqueKey) === -1) {
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collection.push(this.items[iterator]);
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usedKeys.push(uniqueKey);
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}
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}
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}
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return new this.constructor(collection);
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};
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