You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

18 lines
616 B

'use strict';
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
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 get = aCallable(map.get);
var has = aCallable(map.has);
var set = aCallable(map.set);
var value = (call(has, map, key) && 'update' in handler)
? handler.update(call(get, map, key), key, map)
: handler.insert(key, map);
call(set, map, key, value);
return value;
};