Do...While

The do...while statement creates a loop that executes a specified statement until the test condition evaluates to be false. The condition is evaluated after executing the statement. Syntax for do... while is

do {
  // statement
} while (expression);

Lets for example see how to print numbers less than 10 using do...while loop:

var i = 0;
do {
  document.write(i + " ");
  i++; // incrementing i by 1
} while (i < 10);

Note: i = i + 1 can be written i++.