30 lines
1 KiB
JavaScript
Executable file
30 lines
1 KiB
JavaScript
Executable file
'use strict';
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var IS_PURE = require('../internals/is-pure');
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var $ = require('../internals/export');
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var global = require('../internals/global');
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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 = global.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: IS_PURE }, {
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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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