OR(||) Logical Operator in JavaScript

JavaScript logical OR(||) Operator or Logical disjunction Operator operates on a set of operands and returns true even if one of the operands is true. It evaluates the operands from left to right and returns true whenever it encounters the first truthy value otherwise false.

The Logical OR Operator can be used on non-boolean values but it has a lower precedence than the AND operator.

Syntax:

a||b

Example 1: In this example, we will use the OR operator on normal values.

Javascript

console.log(true || false);
console.log(false || false);
console.log(1 || 0);
console.log(1 || 2);
console.log("1" || true);
console.log("0" || true);

Output

true
false
1
1
1
0

Example 2: In this example, we will use the OR operator on function calls.

Javascript

function a() {
    console.log("welcome")
    return true;
}
function b() {
    console.log("Hello")
    return false;
}
console.log(a() || b());

Output

welcome
true

Supported Browsers:

• Chrome
• Edge
• Firefox
• Safari
• Opera

We have a complete list of JavaScript Logical Operators, to learn about those please go through JavaScript Logical Operators article.