JavaScript Loops

Looping in JavaScript are used to repeatedly run a set of instruction while a given condition is true or false. JavaScript programming have four type of Loops.

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JavaScript Loops

The JavaScript loops are used to iterate the piece of code using for, while, do while or for-in loops. It makes the code compact. It is mostly used in array.

There are four types of loops in JavaScript.

for loop
while loop
do-while loop
for-in loop

1) JavaScript For loop

The JavaScript for loop iterates the elements for the fixed number of times. It should be used if number of iteration is known. The syntax of for loop is given below.

for (initialization; condition; increment)
{
    code to be executed
}

Let’s see the simple example of for loop in javascript.

<script>
for (i=1; i<=5; i++)
{
document.write(i + "
")
}
</script>

Test it Now

Output:

2) JavaScript while loop

The JavaScript while loop iterates the elements for the infinite number of times. It should be used if number of iteration is not known. The syntax of while loop is given below.

while (condition)
{
    code to be executed
}

Let’s see the simple example of while loop in javascript.

<script>
var i=11;
while (i<=15)
{
document.write(i + "
");
i++;
}
</script>

Test it Now

Output:

3) JavaScript do while loop

The JavaScript do while loop iterates the elements for the infinite number of times like while loop. But, code is executed at least once whether condition is true or false. The syntax of do while loop is given below.


do{
    code to be executed
}while (condition);

Let’s see the simple example of do while loop in javascript.

<script>
var i=21;
do{
document.write(i + "
");
i++;
}while (i<=25);
</script>

Test it Now

Output:

4) JavaScript for in loop

The JavaScript for in loop is used to iterate the properties of an object. We will discuss about it later.

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JavaScript Loops

JavaScript Loops

1) JavaScript For loop

2) JavaScript while loop

3) JavaScript do while loop

4) JavaScript for in loop

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