JavaScript While Loop

In JavaScript, the while loop is a control flow statement that allows you to execute a block of code repeatedly as long as a specified condition is true. The loop will continue executing until the condition becomes false.

The syntax of a while loop is as follows:

while (condition) {

  // code to be executed

}

Here's how a while loop works:

1. The condition is evaluated before each iteration of the loop. If the condition is true, the code block inside the loop is executed. If the condition is false, the loop is exited, and the program continues with the next statement after the loop.

2. After executing the code block, the program returns to the beginning of the loop and re-evaluates the condition. If the condition is still true, the loop repeats the process. This continues until the condition becomes false.

Here's an example of a while loop that counts from 1 to 5:

var i = 1;

while (i <= 5) {

  console.log(i);

  i++;

}

In the example above, the loop starts with i equal to 1. The condition i <= 5 is checked, and since it is true, the code inside the loop is executed. The value of i is printed to the console, and then i is incremented by 1 with i++. The loop repeats this process until i becomes 6, at which point the condition i <= 5 becomes false, and the loop exits.

The output of the example will be:

1

2

3

4

5

It's important to ensure that the condition in a while loop eventually becomes false; otherwise, the loop will continue indefinitely, resulting in an infinite loop.

The while loop is useful when you want to repeat a block of code an indefinite number of times as long as a certain condition remains true.