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Last change
on this file since b738035 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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100644
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File size:
815 bytes
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| 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var IS_PURE = require('../internals/is-pure');
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| 4 | var anObject = require('../internals/an-object');
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| 5 | var aFunction = require('../internals/a-function');
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| 6 |
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| 7 | // `Set.prototype.update` method
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| 8 | // https://github.com/tc39/proposal-collection-methods
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| 9 | $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
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| 10 | update: function update(key, callback /* , thunk */) {
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| 11 | var map = anObject(this);
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| 12 | var length = arguments.length;
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| 13 | aFunction(callback);
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| 14 | var isPresentInMap = map.has(key);
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| 15 | if (!isPresentInMap && length < 3) {
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| 16 | throw TypeError('Updating absent value');
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| 17 | }
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| 18 | var value = isPresentInMap ? map.get(key) : aFunction(length > 2 ? arguments[2] : undefined)(key, map);
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| 19 | map.set(key, callback(value, key, map));
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| 20 | return map;
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| 21 | }
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| 22 | });
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