JavaScript and React Tips and Tricks: Logical OR and Nullish Coalescing Operator Every JavaScript Programmer Must Know!

Tips and Tricks in JavaScript That Will Raise Your Level.

Photo by Ahsan Avi on Unsplash

Preface

Nullish coalescing is an incredibly useful tool for developers. It can help you write shorter, more concise code, and in many cases, make your code more readable. Let’s take a look at a few examples below to see how nullish coalescing can help you write better code.

JavaScript contains what are called falsy and truthy values, each of which converts to a Boolean value.

There are 6 values ​​that are considered falsy values ​​in JavaScript.

false               Boolean(false)          false
undefined           Boolean(undefined)      false
null                Boolean(null)           false
"" [empty string]   Boolean("")             false
NaN                 Boolean(NaN)            false
0                   Boolean(0)              false

Therefore, if anything is not in the above list, then it will be considered a truthy value.

Defined value: If a value is not undefinedor null, it is considered a defined value.

Logical OR (||)