JavaScript Booleans
In JavaScript, a Boolean is a data type that represents one of two values: true or false.
Booleans are commonly used in conditional statements and logical operations to control the flow of code execution.
Here's an overview of how Booleans work in JavaScript:
- Boolean Literals:
- Boolean Values:
- Boolean Operators:
- Boolean Functions:
Boolean Literals:
The two Boolean literals in JavaScript are true and false.
They are case-sensitive and must be written in lowercase.
Example
let isTrue = true; let isFalse = false;
Boolean Values:
JavaScript has a Boolean data type. It can only take the values true or false.
- YES / NO
- ON / OFF
- TRUE / FALSE
Example
let falsyValue = false;
if (falsyValue) {
console.log('This will not be executed.');
} else {
console.log('Falsy values evaluate to false in a Boolean context.');
}
Boolean Operators:
JavaScript provides several operators for working with Boolean values.
- Logical AND (&&): Returns true if both operands are true.
- Logical OR (||): Returns true if at least one operand is true.
- Logical NOT (!): Returns true if the operand is false, and false if the operand is true.
Example
let a = true; let b = false; console.log(a && b); // Output: false console.log(a || b); // Output: true console.log(!a); // Output: false