JavaScript classes have constructors, let you define fields and methods, enable encapsulation with private fields, and permit inheritance.

"typeof" and "instanceof" perform the type checking in JavaScript. While they are generally simple to use, make sure to known the edge cases.

How to design React components that are easy to change, maintain, and test? Strive to orthogonal React components.

15 operations on arrays in JavaScript: iterate, map, reduce, concat, slice, clone, search, query, filter, insert, remove, empty, fill, flatten and sort.

React useState() hook manages the state of functional components.

Lifecycle methods, hooks & suspense fetch data in React. The post describes them in examples and demos, distill the benefits and drawbacks of each one.

A closure is a function that captures variables from where it is defined (or its lexical scope).

The stale closures is a pitfall of React hooks when an outdated variable is captured by a closure.

A compiled list of simple but tricky questions you might be asked during a JavaScript coding interview.

Map complements plain objects. Map's main benefits over plain object is allowing keys of any type and any name.