19 lines
529 B
JavaScript
19 lines
529 B
JavaScript
'use strict';
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var $ = require('../internals/export');
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var aMap = require('../internals/a-map');
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var MapHelpers = require('../internals/map-helpers');
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var get = MapHelpers.get;
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var has = MapHelpers.has;
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var set = MapHelpers.set;
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// `Map.prototype.getOrInsert` method
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// https://github.com/tc39/proposal-upsert
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$({ target: 'Map', proto: true, real: true, forced: true }, {
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getOrInsert: function getOrInsert(key, value) {
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if (has(aMap(this), key)) return get(this, key);
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set(this, key, value);
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return value;
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}
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});
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