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27 lines
968 B
27 lines
968 B
'use strict'; |
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var $ = require('../internals/export'); |
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var call = require('../internals/function-call'); |
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var anObject = require('../internals/an-object'); |
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var aCallable = require('../internals/a-callable'); |
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var $TypeError = TypeError; |
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// `Set.prototype.update` method |
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// https://github.com/tc39/proposal-collection-methods |
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$({ target: 'Map', proto: true, real: true, forced: true }, { |
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update: function update(key, callback /* , thunk */) { |
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var map = anObject(this); |
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var get = aCallable(map.get); |
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var has = aCallable(map.has); |
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var set = aCallable(map.set); |
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var length = arguments.length; |
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aCallable(callback); |
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var isPresentInMap = call(has, map, key); |
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if (!isPresentInMap && length < 3) { |
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throw $TypeError('Updating absent value'); |
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} |
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var value = isPresentInMap ? call(get, map, key) : aCallable(length > 2 ? arguments[2] : undefined)(key, map); |
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call(set, map, key, callback(value, key, map)); |
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return map; |
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} |
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});
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