This tutorial provides a comprehensive guide to JavaScript Map and Set, explaining their differences, use cases, and how to use them.

But help is on the way, with both the built-in map/set type and weak reference issues getting fixed in ES6, Webber said. But until ES6 can be relied upon, there is no good way to emulate them ...

JavaScript’s reduce is one of the most useful array methods that should be in a developer’s arsenal. Introduced in ES5, it’s somewhat similar to for…each and map methods that are used with ...