14 lines
397 B
JavaScript
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;
|
|
};
|