JS Loops

JavaScript Loops

Loop is a control structure that allows you to execute a block of code multiple times. There are three types of loops in JavaScript: for loop, while loop, and do-while loop.

Js For Loop

For loop: The for loop is used to execute a block of code a specified number of times. It has three parts: initialization, condition, and increment/decrement. Syntax: for (initialization; condition; increment/decrement) { // code here }

Here's an example of for loop in JavaScript

// JavaScript for loop code example
for (let i = 0; i < 5; i++) {
    console.log(i);
   }
   
/*
Output:
0
1
2
3
4
*/

While Loop

While loop: The while loop is used to execute a block of code as long as the specified condition is true. Syntax: while (condition) { // code here };

Here's an example of while loop in JavaScript


// JavaScript while loop code example
let i = 0;

while (i < 5) {
  console.log(i);
  i++;
  }
/*
Output:

0
1
2
3
4
*/

Do While Loop

The do-while loop is similar to the while loop, except that the code block is executed at least once, even if the condition is false. Syntax: do { // code to be executed } while (condition);

Here's an example of do while loop in JavaScript

// JavaScript do while loop code example

let i = 0;

do {
  console.log(i);
  i++;
   } while (i < 5);
/*
Output:

0
1
2
3
4
*/

Conclusion

Overall, JavaScript loops are used to repeatedly run a block of code - until a certain condition is met. When developers talk about iteration or iterating over, say, an array, it is the same as looping.

Now challenge yourself, click the link below to practice!

https://codepen.io/pen/