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23 lines
721 B
23 lines
721 B
'use strict'; |
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var anObject = require('../internals/an-object'); |
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// `Map.prototype.upsert` method |
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// https://github.com/thumbsupep/proposal-upsert |
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module.exports = function upsert(key, updateFn /* , insertFn */) { |
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var map = anObject(this); |
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var insertFn = arguments.length > 2 ? arguments[2] : undefined; |
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var value; |
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if (typeof updateFn != 'function' && typeof insertFn != 'function') { |
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throw TypeError('At least one callback required'); |
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} |
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if (map.has(key)) { |
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value = map.get(key); |
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if (typeof updateFn == 'function') { |
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value = updateFn(value); |
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map.set(key, value); |
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} |
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} else if (typeof insertFn == 'function') { |
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value = insertFn(); |
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map.set(key, value); |
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} return value; |
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};
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