JavaScript For Loops: A Complete Guide

A for loop is used to run a block of code repeatedly for a specified number of times, based on a condition. It is one of the most common control structures in JavaScript.

Syntax:

for (initialization; condition; increment/decrement) { 
  // Code to execute 
}

Initialization: Sets the starting value for the loop variable.
Condition: Specifies when the loop should stop (must evaluate to false to terminate the loop).
Increment/Decrement: Updates the loop variable after each iteration.

Basic Loop

for (let i = 0; i < 5; i++) {

console.log("Iteration number:", i);

}

Try it yourself

Iterating Over an Array

let fruits = ["Apple", "Banana", "Cherry"];

for (let i = 0; i < fruits.length; i++) {

console.log(fruits[i]);

}

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Looping in Reverse

for (let i = 5; i > 0; i--) {

console.log("Iteration number:", i);

}

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Nested for Loop

for (let i = 1; i <= 3; i++) {

for (let j = 1; j <= 2; j++) {

console.log(`Outer loop: ${i}, Inner loop: ${j}`);

}

Try it yourself

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