28 lines
968 B
JavaScript
28 lines
968 B
JavaScript
'use strict';
|
|
var $ = require('../internals/export');
|
|
var call = require('../internals/function-call');
|
|
var anObject = require('../internals/an-object');
|
|
var aCallable = require('../internals/a-callable');
|
|
|
|
var $TypeError = TypeError;
|
|
|
|
// `Set.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 = anObject(this);
|
|
var get = aCallable(map.get);
|
|
var has = aCallable(map.has);
|
|
var set = aCallable(map.set);
|
|
var length = arguments.length;
|
|
aCallable(callback);
|
|
var isPresentInMap = call(has, map, key);
|
|
if (!isPresentInMap && length < 3) {
|
|
throw $TypeError('Updating absent value');
|
|
}
|
|
var value = isPresentInMap ? call(get, map, key) : aCallable(length > 2 ? arguments[2] : undefined)(key, map);
|
|
call(set, map, key, callback(value, key, map));
|
|
return map;
|
|
}
|
|
});
|