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2021-04-02 02:24:13 +03:00

14 lines
397 B
JavaScript

'use strict';
var anObject = require('../internals/an-object');
// `Map.prototype.emplace` method
// https://github.com/thumbsupep/proposal-upsert
module.exports = function emplace(key, handler) {
var map = anObject(this);
var value = (map.has(key) && 'update' in handler)
? handler.update(map.get(key), key, map)
: handler.insert(key, map);
map.set(key, value);
return value;
};