Last Updated : 14 Mar, 2023
JavaScript NOT Operator can be used to find the flipped value of a boolean. It can be used to convert a true value to a false and vice-versa. This NOT operator can also be used on non-booleans to convert them to the reverse of their actual boolean value. A NOT operator can be used with another NOT operator to get the original value back.
Syntax:
!a
Return Type: Flipped boolean value.
Example 1: In this example, we will use the NOT operator on some boolean and other data types.
JavaScript
console.log(!true);
console.log(!false);
console.log(!"1");
console.log(!"");
console.log(!null);
Output: We can see that the values converted to true are flipped and false is returned and vice versa.
false true false true true
Example 2: In this example, we will use two NOT operators on the same boolean and other data types.
JavaScript
console.log(!!true);
console.log(!!false);
console.log(!!"1");
console.log(!!"");
console.log(!!null);
Output: When we applied the NOT operator two times we got the original boolean value back.
true false true false false
Supported Browsers:
We have a complete list of JavaScript Logical Operators, to learn about those please go through JavaScript Logical Operator article.
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