| 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var aCallable = require('../internals/a-callable');
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| 4 | var aMap = require('../internals/a-map');
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| 5 | var MapHelpers = require('../internals/map-helpers');
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| 6 |
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| 7 | var $TypeError = TypeError;
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| 8 | var get = MapHelpers.get;
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| 9 | var has = MapHelpers.has;
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| 10 | var set = MapHelpers.set;
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| 11 |
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| 12 | // `Map.prototype.update` method
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| 13 | // https://github.com/tc39/proposal-collection-methods
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| 14 | $({ target: 'Map', proto: true, real: true, forced: true }, {
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| 15 | update: function update(key, callback /* , thunk */) {
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| 16 | var map = aMap(this);
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| 17 | var length = arguments.length;
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| 18 | aCallable(callback);
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| 19 | var isPresentInMap = has(map, key);
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| 20 | if (!isPresentInMap && length < 3) {
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| 21 | throw new $TypeError('Updating absent value');
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| 22 | }
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| 23 | var value = isPresentInMap ? get(map, key) : aCallable(length > 2 ? arguments[2] : undefined)(key, map);
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| 24 | set(map, key, callback(value, key, map));
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| 25 | return map;
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| 26 | }
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| 27 | });
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