The best alternatives to JavaScript Operator Lookup are JavaScript.com, Learn JavaScript, and JsTips. If these 3 options don't work for you, we've listed a few more alternatives below.
The book is an ilustrated guide to 50 of the most interesting JavaScript topics. You'll learn about destructing, iterables, generators, helpful browser APIs, higher-order functions, memoization and design patterns.
Designed for developers looking to deepen their JavaScript expertise, this course presents a series of videos that explore powerful concepts and techniques beyond the popular and widely-used basics.