Do-While Loop

A do-while loop in JavaScript works like a while loop but always executes the code at least once, even if the condition is false initially. It then keeps running as long as the condition is true.

Syntax

do {
    // Code block to be executed 
} while (condition);

Example: Counting from 1 to 5

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

Output:

1
2
3
4
5

Parameters

• statement
  A statement that is executed at least once and re-executed as long as the condition evaluates to true.
  You can use a block statement ({ ... }) to execute multiple statements.

• condition
  An expression evaluated after each pass through the loop.
  If this condition evaluates to true, the statement is re-executed.
  When the condition evaluates to false, execution continues with the statement after the do...while loop.

Description

Like other looping statements, you can use control flow statements inside do...while:

• break stops statement execution and goes to the first statement after the loop.
• continue stops the current iteration and re-evaluates the condition for the next pass.

The do...while statement syntax requires a semicolon at the end, but JavaScript’s automatic semicolon insertion (ASI) might add one if it's missing.

Comparison Between While and Do-While Loop