7 different ways of Looping in JavaScript with example.

In this blog, you will learn about the 7 different ways of Looping in JavaScript with the help of examples.

For example, if you want to show a message 100 times, then you can use a loop. It's just a simple example; you can achieve much more with loops.

List of Loops in JavaScript

There are 7 kinds of loops you will find in JavaScript. I've listed them in an order that will help you to get a clear view of their working process and usage. This article will also help you to differentiate between all these 7 loops like where, when, or how you should use them. So let’s start.

1. while
2. do-while
3. for
4. forEach()
5. map()
6. for…in
7. for…of

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1. while loop

while loop is one of the most basic kinds of loops available in JS. If JavaScript is not the only programming language you know, you must have heard about this one already.

The while statement generates a loop that gets executed over a particular block of the statement (code) as long as the condition is true. Every time before executing the block of code the condition gets checked.

while loop Syntax

while (condition) {
Block of code
}

while loop Example

let i=5;
while (i<10){
 console.log("I is less than 10");
 i++;
}

Output

I is less than 10
I is less than 10
I is less than 10
I is less than 10
I is less than 10

In the above example, the condition is getting checked if the value of i is less than 10 or not. If the condition is true, the block of code gets executed and before iterating next time the value of i is getting increases by 1 as we’ve added a statement i++.

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2. do-while Loop

do-while loop is slightly different from while as it includes one extra feature. In case of do-while loop, the block of code gets executed at least once and if further the condition satisfies the code block will be executed accordingly.

do-while Loop Syntax

do {
Block of code
}
while (condition);

Example

let i=5;
do{
    console.log("The value of i is " + i);
    i++;
}
while(i>5 && i<10);

Output

The value of i is 5
The value of i is 6
The value of i is 7
The value of i is 8
The value of i is 9

As you can see the condition is- *the value of i is greater than 7 but less than 10; but in output the value of i=7 has been printed. Because this looping technique first do execute the code irrespective of the condition and then compares the condition from 2nd round of execution. For all the true condition from the 2nd looping round the code block will be executed.

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