Looping Statements in JS

Looping Statements in JavaScript

Looping statements in JavaScript are used to repeat a block of code multiple times until a condition becomes false. Instead of writing the same code again and again, loops help make the code shorter and easier to manage.

JavaScript mainly provides the following loops:

1) for Loop

The for loop is used when we know how many times the loop should run.

for (let i = 1; i <= 5; i++) {
    console.log(i);
}

Output:

1
2
3
4
5

Here, the loop starts from 1 and runs until 5.

2) while Loop

The while loop runs as long as the given condition is true.

let i = 1;
while (i <= 5) {
    console.log(i);
    i++;
}

This also prints numbers from 1 to 5.

Example Programs:

Looping Programs in JavaScript

1) 1 1 1 1 1

Print the number 1 five times.

for (let i = 1; i <= 5; i++) {
    console.log(1);
}

Output:

1
1
1
1
1

2) 1 2 3 4 5

Print numbers from 1 to 5.

for (let i = 1; i <= 5; i++) {
    console.log(i);
}

Output:

1
2
3
4
5

3) 1 3 5 7 9

Print the first five odd numbers.

for (let i = 1; i <= 9; i += 2) {
    console.log(i);
}

Output:

1
3
5
7
9

4) 3 6 9 12 15

Print multiples of 3.

for (let i = 3; i <= 15; i += 3) {
    console.log(i);
}

Output:

3
6
9
12
15

Conclusion

Loops are very useful in JavaScript for performing repetitive tasks such as printing numbers, iterating through arrays, and processing data efficiently.