JavaScript Do-While Loop

JavaScript Do-While Loop

JavaScript Do-While Loop is used to execute a block of code for one or more number of times based on a condition.

The basic difference between while and do-while loop is that, in while loop the condition is checked before execution of block, but in do-while the condition is checked after executing the block. Because of this, the code inside the loop is executed at least one in a do-while loop.

In this tutorial, we will learn how to define/write a JavaScript Do-While loop, and its usage using example programs.

Syntax

The syntax of JavaScript Do-While Loop is

do {
     //statements
 } while (condition);

where condition is the expression which is checked after executing the statements inside the loop.

do and while are keywords.

Examples

In the following example, we execute a block of code that appends ‘hello world’ to a pre block HTML element ten times using a Do-While Loop.

index.html

Even if the condition is false for the first time, the code inside loop will be executed at least once.

Conclusion

In this JavaScript Tutorial, we learned about Do-While Loop, its syntax, and usage with examples.