Harsh Sakhiya
In programming, you'll often need to do something multiple times — like print numbers, process lists, or check values.
Instead of writing the same code over and over, we use loops to automate repetition.
🔁 What is a Loop?
A loop is a tool that allows your code to repeat a block of instructions until a condition is met.
✅ Types of Loops in JavaScript
Let’s look at the most common ones:
🔁 1. for Loop
Use it when you know how many times you want to run the code.
for (let i = 1; i <= 5; i++) {
console.log("Number:", i);
} i= 1: Start at 1
i <= 5: Run as long as i ≤ 5
i++: Increase i by 1 each time
🔄 2. while Loop
Use it when the condition is checked before each run.
let count = 1;
while (count <= 3) {
console.log("Count:", count);
count++;
}🔁 3. do...while Loop
Runs the block at least once, then checks the condition.
let num = 1;
do {
console.log("Num:", num);
num++;
} while (num <= 2);📦 4. for...of Loop (Used with arrays)
Great for looping throught items in an array.
let colors = ["red", "green", "blue"];
for (let color of colors) {
console.log(color);
}🔧 Quick Tip
🧠 Don’t forget to update the loop condition — or your loop might run forever! (infinite loop 🔁😱)
🧪 Practice Challenge
Try this:
for (let i = 0; i < 4; i++) {
console.log("JS is fun!");
}Then change it to print numbers 1 to 10, or loop through an array of fruits.
👋 Sign-Off
Loops help you do more with less code. They’re the heart of automation in programming.
Next up, we’ll dive into Arrays — and how to manage lists of values.
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