do...while keyword

Using do...while

In the following example, the do...while loop iterates at least once and reiterates until i is no longer less than 5.

let result = '';
let i = 0;
do {
  i += 1;
  result += `${i} `;
}
while (i > 0 && i < 5);
// Despite i === 0 this will still loop as it starts off without the test

console.log(result);

Using an assignment as a condition

In some cases, it can make sense to use an assignment as a condition – but when you do, there's a right way to do it, and a wrong way; the while documentation has a Using an assignment as a condition section with an example showing a general best-practice syntax you should know about and follow.