Question

Why do we use while loops in JavaScript?



To break out of some block of code


To do something if a condition is true


To repeat some code while a condition is true


To repeat something for a fixed number of times

Answer 1

In JavaScript, we use while loops primarily for the following reason:

**To repeat some code while a condition is true.**

A while loop continues to execute its block of code as long as the specified condition evaluates to `true`. Once the condition becomes `false`, the loop stops executing. It is particularly useful when the number of iterations is not known in advance and depends on dynamic conditions.

Here's a simple example:

```javascript
let count = 0;

while (count < 5) {
console.log(count);
count++;
}
```

In this example, the code inside the while loop will run as long as `count` is less than 5.

The other options you mentioned do not accurately describe the purpose of a while loop:

- To break out of some block of code: This describes behavior used with the `break` statement rather than the while loop itself.
- To do something if a condition is true: This is more related to conditional statements like `if`.
- To repeat something for a fixed number of times: This is more characteristic of for loops, where the number of iterations is predetermined.

In summary, a while loop is designed for executing code repetitively while a certain condition holds true.