JavaScript Loop Programs for Practice
Master JavaScript for loops with 30 hands-on coding exercises, hints, solutions, an interactive code playground and a quick knowledge quiz.
Start Practicing ↓What is a JavaScript for loop?
A for loop repeats a block of code while a condition is true. It is useful for counting, processing arrays, calculating totals and printing patterns.
for (let i = 1; i <= 5; i++) {
console.log(i);
}1. Initialization
let i = 1
Sets the starting value.
2. Condition
i <= 5
Checks whether the loop should continue.
3. Increment
i++
Increases the counter by one.
Practice Exercises
Search a program, select a difficulty and mark each task as completed when you solve it.
You have completed 0 out of 30 programs.
Solutions are provided for learning. Try solving each exercise before revealing the answer.
JavaScript Loop Code Playground
Write your own JavaScript program below and click Run Code to see the output. The playground captures console.log statements.
Test Your JavaScript Loop Knowledge
Choose an answer for each question and check your score.
Frequently Asked Questions
What is the difference between for and while loops?
A for loop is convenient when the counting or iteration steps are known. A while loop repeats as long as its condition remains true.
Can I use a for loop to iterate over an array?
Yes. You can use an index-based for loop to visit each array element, or use for...of when you want to iterate over values directly.
How can I avoid an infinite loop?
Make sure the loop condition can eventually become false and that the counter or other relevant state changes as expected.
Do I need to memorize all the solutions?
No. Understand initialization, conditions and updates, then practice writing your own solutions and testing different inputs.