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.
27 lines
922 B
27 lines
922 B
'use strict'; |
|
var $ = require('../internals/export'); |
|
var aCallable = require('../internals/a-callable'); |
|
var aMap = require('../internals/a-map'); |
|
var MapHelpers = require('../internals/map-helpers'); |
|
|
|
var $TypeError = TypeError; |
|
var get = MapHelpers.get; |
|
var has = MapHelpers.has; |
|
var set = MapHelpers.set; |
|
|
|
// `Map.prototype.update` method |
|
// https://github.com/tc39/proposal-collection-methods |
|
$({ target: 'Map', proto: true, real: true, forced: true }, { |
|
update: function update(key, callback /* , thunk */) { |
|
var map = aMap(this); |
|
var length = arguments.length; |
|
aCallable(callback); |
|
var isPresentInMap = has(map, key); |
|
if (!isPresentInMap && length < 3) { |
|
throw new $TypeError('Updating absent value'); |
|
} |
|
var value = isPresentInMap ? get(map, key) : aCallable(length > 2 ? arguments[2] : undefined)(key, map); |
|
set(map, key, callback(value, key, map)); |
|
return map; |
|
} |
|
});
|
|
|