How to Write a While Loop in JavaScript ?

In JavaScript, a while loop is a control flow statement that repeatedly executes a block of code as long as a specified condition is true.

Syntax:

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

The loop continues to execute the block of code within its curly braces ({}) as long as the specified condition evaluates to true. If the condition evaluates to false initially, the block of code inside the loop will not be executed at all.

Example: Here, the while loop continues to execute as long as the count variable is less than 5. Inside the loop, we log the current value of count to the console and then increment count by 1 in each iteration. Once count reaches 5, the condition count < 5 becomes false, and the loop terminates.

Javascript

let count = 0;

while (count < 5) {
  console.log("Count:", count);
  count++; // Increment the count by 1 in each iteration
}

Output

Count: 0
Count: 1
Count: 2
Count: 3
Count: 4