If the evaluation is true, the loop body executes again. The execution flowchart for the do-while loop in JavaScript is as shown in the below figure.įrom the do-while loop flowchart, it is clear that the loop body executes first, and then the loop conditional expression evaluates to determine whether to continue or end the loop. In the above syntax, do and while are keywords. We do not need to use curly braces if there is only one statement inside the do…while loop. The test condition inside do while statement must be a boolean expression that generates either true or false. The do-while loop always executes the statements in the body loop at least once before the expression evaluates because its test conditional expression is at the bottom of the loop. We can handle such situations with the help of do-while loop in JavaScript. However, sometimes, it might need to execute the statements in the loop body at least once before the test performs.

If the condition is initially false, the body of loop will not execute at all. In the while loop statement, the test condition evaluates first before the loop body executes.

In this type of loop, the body of loop executes first and then evaluates conditional expression. The general syntax for do while loop in JavaScript is as: // Initialization: This means that the body of loop always executes at least once. The condition or expression evaluates at the end of loop rather than the beginning.

Do while javascript