Truthy and Falsy Values in JavaScript

Truthy and Falsy Values in JavaScript

• In JavaScript, values used inside a condition are automatically converted into either true or false.
• This concept is called Truthy and Falsy values.
• It is very important in conditional statements like if, else, and while.

What are Truthy Values?

• A truthy value is any value that JavaScript treats as true when used inside a condition. Examples of Truthy Values

1
-10
"Hello"
"CSK"
[]
{}
true

Example Program

let team = "CSK";

if (team) {
    console.log("Team exists");
}

Output

Team exists

• Since "CSK" is a non-empty string, JavaScript treats it as true.

What are Falsy Values?

• A falsy value is any value that JavaScript treats as false in a condition.

Falsy Values in JavaScript

• There are only a few falsy values:

false
0
""
null
undefined
NaN

Example Program

let score = 0;

if (score) {
    console.log("Pass");
} else {
    console.log("No score");
}

Output

No score

• Since 0 is a falsy value, the else block runs.

Simple Example

let name = "";

if (name) {
    console.log("Welcome");
} else {
    console.log("Enter your name");
}

Output

Enter your name

• Because an empty string "" is falsy, JavaScript executes the else block.

Why is it Important?

Truthy and falsy values help in:

• checking empty input fields
• validating forms
• checking login details
• making decisions in programs

Conclusion
Truthy and falsy values are the foundation of decision making in JavaScript.