2 var IS_PURE = require('../internals/is-pure');
3 var $ = require('../internals/export');
4 var global = require('../internals/global');
5 var call = require('../internals/function-call');
6 var anObject = require('../internals/an-object');
7 var aCallable = require('../internals/a-callable');
9 var TypeError = global.TypeError;
11 // `Set.prototype.update` method
12 // https://github.com/tc39/proposal-collection-methods
13 $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
14 update: function update(key, callback /* , thunk */) {
15 var map = anObject(this);
16 var get = aCallable(map.get);
17 var has = aCallable(map.has);
18 var set = aCallable(map.set);
19 var length = arguments.length;
21 var isPresentInMap = call(has, map, key);
22 if (!isPresentInMap && length < 3) {
23 throw TypeError('Updating absent value');
25 var value = isPresentInMap ? call(get, map, key) : aCallable(length > 2 ? arguments[2] : undefined)(key, map);
26 call(set, map, key, callback(value, key, map));