JavaScript Boolean In Javascript Interview Questions & Answers

Q1. What is Boolean in JavaScript?

Boolean is a data type that represents logical values. It can have only two possible values:

Booleans are mainly used in conditions, comparisons, and decision-making.

Example

let isLoggedIn = true;
let isAdmin = false;

Q2. Where Are Boolean Values Commonly Used?

Boolean values are commonly used in:

Example

let age = 18;

if(age >= 18) {
    console.log(true);
}

Q3. How Are Boolean Values Created in JavaScript?

Boolean values can be created in two ways:

1. Direct Assignment

let status = true;

2. Using Comparison

let result = 10 > 5;
console.log(result);

Output

true

Q4. What is Boolean Conversion in JavaScript?

JavaScript automatically converts values into Boolean when used in conditions. This process is called Boolean conversion.

Example

Boolean(1);      // true
Boolean(0);      // false
Boolean("");     // false
Boolean("Hello"); // true

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