We all want to build powerful applications and avoid unnecessary renders. There are some hooks available to help with this, but you might not be sure about which one to use and when.

Some JavaScript (ECMAScript) features are easier to understand than others. Generators look weird — like pointers in C/C++. Symbols manage to look like both primitives and objects at the same time.

Class Inheritance: A class is like a blueprint — a description of the object to be created. Classes inherit from classes and create subclass relationships: hierarchical class taxonomies..

A closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function’s scope from an inner function. In JavaScript, closures are created every time a function is created, at function creation time..

A promise is an object that may produce a single value some time in the future: either a resolved value, or a reason that it’s not resolved (e.g., a network error occurred). A promise may be in one of 3 possible states: fulfilled, rejected, or pending. Promise users can attach callbacks to handle the fulfilled value or the reason for rejection.

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