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18 lines
616 B
18 lines
616 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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|
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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 = (call(has, map, key) && 'update' in handler) |
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? handler.update(call(get, map, key), key, map) |
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: handler.insert(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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