In this lesson, you'll learn about the operator in JavaScript, which inverts the truthiness of values, helping you manage conditions effectively.

Not Operator

An exclamation sign is known as the NOT operator. It reverses the boolean result of the condition.

The syntax is pretty simple:

console.log(!true); // false

The operator accepts a single argument and does the following:

1. Converts the operand to boolean type: .
2. Returns the inverse value.

For instance:

console.log(!true); // false
console.log(!0); // true

Double Not Operator

A double NOT is sometimes used for converting a value to boolean type:

console.log(!!"truthy"); // true
console.log(!!null); // false