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17 lines
327 B
17 lines
327 B
'use strict';
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module.exports = function shift() {
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if (Array.isArray(this.items) && this.items.length) {
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return this.items.shift();
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}
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if (Object.keys(this.items).length) {
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var key = Object.keys(this.items)[0];
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var value = this.items[key];
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delete this.items[key];
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return value;
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}
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return null;
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};
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