How to use the ! Operator to negate a Boolean Value in JavaScript ?
In JavaScript, you can use the ! (logical NOT) operator to negate a boolean value. The ! operator flips the truthiness of a value. If the operand is true, it becomes false, and if the operand is false, it becomes true.
Example: Here, !isTrue evaluates to false, and !isFalse evaluates to true.
Javascript
let isTrue = true;let isFalse = false;let negatedTrue = !isTrue;let negatedFalse = !isFalse;console.log(negatedTrue); // Outputs falseconsole.log(negatedFalse); // Outputs true |
Output
false true
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