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15 lines
326 B
15 lines
326 B
'use strict';
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module.exports = function union(object) {
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var _this = this;
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var collection = JSON.parse(JSON.stringify(this.items));
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Object.keys(object).forEach(function (prop) {
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if (_this.items[prop] === undefined) {
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collection[prop] = object[prop];
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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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