TypeScript do while

Summary: In this tutorial, you will learn how to use the do...while statement to create a loop that runs until a condition evaluates to false.

Introduction to TypeScript do…while statement #

The following shows the syntax of the do...while statement:

do {
    // do something
} while(condition);
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The do...while statement executes statements in its body surrounded by the curly braces ({}) until the condition is false.

The do...while statement always executes its loop body at least once.

Unlike the while statement, the do...while statement evaluates the condition after each loop iteration; therefore, it is called a post-test loop.

TypeScript do…while statement example #

The following example uses the do...while statement to output numbers from 0 to 9 to the console:

let i = 0;

do {
    console.log(i);
    i++
} while (i < 10);
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Try it

Output:

0
1
2
3
4
5
6
7
8
9
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How it works:

• First, declare a variable i and initialize it to zero before entering the loop.
• Then, output i to the console, increment it by one, and check if it is less than 10. If it is, repeat the loop until i greater than or equal 10.

Summary #

• Use the do...while statement to create a loop that runs until a condition evaluates to false.

Quiz #