Logical operators

Overview

The operators available in Javascript are shown in the table below.

Name	Usage	Evaluates to
AND	a && b	true if a and b are both true, otherwise false
OR	a || b	true if a is true or b is true (or both), otherwise false
NOT	!a	the opposite of a (false if a is true; true if a is false)

Using the operators

Here are some examples of using the operators:

js

const isBookAvailable = false
const hasOverdueBooks = true

console.log(!isBookAvailable) // NOT
console.log(isBookAvailable && hasOverdueBooks) // AND
console.log(isBookAvailable || hasOverdueBooks) // OR

output

true
false
true