debian-mirror-gitlab/core-js/modules/esnext.map.update.js
2019-09-25 13:30:05 +05:30

22 lines
815 B
JavaScript

'use strict';
var $ = require('../internals/export');
var IS_PURE = require('../internals/is-pure');
var anObject = require('../internals/an-object');
var aFunction = require('../internals/a-function');
// `Set.prototype.update` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
update: function update(key, callback /* , thunk */) {
var map = anObject(this);
var length = arguments.length;
aFunction(callback);
var isPresentInMap = map.has(key);
if (!isPresentInMap && length < 3) {
throw TypeError('Updating absent value');
}
var value = isPresentInMap ? map.get(key) : aFunction(length > 2 ? arguments[2] : undefined)(key, map);
map.set(key, callback(value, key, map));
return map;
}
});