Question

to determine a loop what statement is used​

Answer 1

Loops: while and for

We often need to repeat actions.

For example, outputting goods from a list one after another or just running the same code for each number from 1 to 10.

Loops are a way to repeat the same code multiple times.

The “while” loop

The while loop has the following syntax:

while (condition) {

// code

// so-called "loop body"

}

While the condition is truthy, the code from the loop body is executed.

For instance, the loop below outputs i while i < 3:

let i = 0;

while (i < 3) { // shows 0, then 1, then 2

alert( i );

i++;

}

A single execution of the loop body is called an iteration. The loop in the example above makes three iterations.

If i++ was missing from the example above, the loop would repeat (in theory) forever. In practice, the browser provides ways to stop such loops, and in server-side JavaScript, we can kill the process.

Any expression or variable can be a loop condition, not just comparisons: the condition is evaluated and converted to a boolean by while.