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• esnext.weak-map.get-or-insert.js

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package.modules.esnext.weak-map.get-or-insert.js Maven / Gradle / Ivy

'use strict';
var $ = require('../internals/export');
var aWeakMap = require('../internals/a-weak-map');
var WeakMapHelpers = require('../internals/weak-map-helpers');

var get = WeakMapHelpers.get;
var has = WeakMapHelpers.has;
var set = WeakMapHelpers.set;

// `WeakMap.prototype.getOrInsert` method
// https://github.com/tc39/proposal-upsert
$({ target: 'WeakMap', proto: true, real: true, forced: true }, {
  getOrInsert: function getOrInsert(key, value) {
    if (has(aWeakMap(this), key)) return get(this, key);
    set(this, key, value);
    return value;
  }
});