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25 lines
739 B
25 lines
739 B
'use strict';
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var call = require('../internals/function-call');
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var aCallable = require('../internals/a-callable');
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var anObject = require('../internals/an-object');
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// `Map.prototype.emplace` method
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// https://github.com/thumbsupep/proposal-upsert
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module.exports = function emplace(key, handler) {
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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 value, inserted;
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if (call(has, map, key)) {
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value = call(get, map, key);
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if ('update' in handler) {
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value = handler.update(value, key, map);
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call(set, map, key, value);
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} return value;
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}
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inserted = handler.insert(key, map);
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call(set, map, key, inserted);
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return inserted;
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};
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