conditional statements in JS

Nandhini — Sun, 20 Sep 2026 14:24:15 +0000

Conditional statements allows us to perform various different operations for different conditions. It run different code depending on true or false conditions.

It includes;

if statement
if.. else.. statement
if.. else if.. else.. statement
switch statement
ternary

If statement

"if" statement is used when specific code needs to executed if the given conditions is true.

Syntax:
if (condition == true){
/execute the block of code/
}

If.. else.. statement

"If.. else" statement, if used when given condition is true and block is executed. And, else is used when given condition is false.

Syntax:
if (condition == true){
/execute the block of code if condition is true/
} else{
/execute the block of code if condition is false/
}

similarly other statements also execute depending on true or false. In switch statement, it has multiple options...

JavaScript "Variables"

Nandhini — Sat, 29 Aug 2026 15:14:13 +0000

Hi all, I learned about variables in JavaScript recently.
Variables are containers which used to store data.

It can be declared in 4 ways.

Using let e.g.,

let x=2;
let y=3;
let z=x+y;

Using Const e.g.,

const x=3;
const y=4;
const z=x*y;

Using Var e.g.,

var a=1;
var b=1;
var c=a-b;

Automatically

a=10;
b=5;
c=a-b;

DEV Community: Nandhini

conditional statements in JS

JavaScript "Variables"