ECMAScript 2015 (ES6)
Support for the ECMAScript 2015 specification. Features include Promises, Modules, Classes, Template Literals, Arrow Functions, Let and Const, Default Parameters, Generators, Destructuring Assignment, Rest & Spread, Map/Set & WeakMap/WeakSet and many more.
javascript built-in: weakset
javascript built-in: weakset: add
javascript built-in: weakset: delete
javascript built-in: weakset: has
javascript built-in: weakset: non-registered symbols as keys
javascript built-in: weakset: `weakset()` constructor
javascript built-in: weakset: `weakset()` constructor: `new weakset(iterable)`
javascript built-in: weakset: `weakset()` constructor: `new weakset(null)`
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