JS Loop While

Loops can execute a block of code as long as a specified condition is true.

The While Loop

The while loop loops through a block of code as long as a specified condition is true.

while (condition) {
  // code block to be executed
}

Note: If you forget to increase the variable used in the condition, the loop will never end. This will crash your browser.

The Do/While Loop

The do...while loop is a variant of the while loop. This loop will execute the code block once, before checking if the condition is true, then it will repeat the loop as long as the condition is true.

Comparing For and While

If you have read the previous chapter about the for loop, you will discover that a while loop is much like a for loop, with statement 1 and statement 3 omitted. The loop in this example uses a while loop to collect the car names from the cars array: