Loved by 200+ aspiring devs
Become great at frontend the fun way
Platform which helps you master frontend development with interactive challenges, quizzes, and real-world projects.
It’s free, no sign-in required
30+ challenges
Crafted by senior
frontend engineers
frontend engineers
11 UI components
300+ quizzes
Platform that makes learning web development fun
Learn in an interactive way, skip the boring stuff and become a great frontend developer
Instructions
Solution
Your task is to write a function called JoinStrings which takes 2 strings and joins them together
Test case #1:
Passed
Test case #2:
Passed
Test case #3:
Failed
Run code
Learn in interactive environment
VSCode powered editor with browser preview, simulated browser console and test cases
Async Javascript
React Hooks
CSS Animations
Trivia questions
Fun way to quickly test and reinforce your frontend knowledge based on categories
Pawel Boguta
Progress tracking
Don’t loss morale. Track your progress and stay motivated as you learn frontend development.
0%
Categories
Check what are your weak points and improve them with category based challenges.
Seamless coding playground
An in-browser code editor built just like VSCode, complete with all the familiar features and shortcuts you use every day.
Multi-lang support
Practice your favourite tech stack
Intelissense
Supports autocompletion, warnings and errors.
Shortcuts
Don't adjust, have all of your VSCode shortcuts.
File system
Build projects in the way you like.
Split screen
Browser editor that enhances productivity.
Realtime Search
Navigate quickly through your code.
Tests
Run build-in unit tests right in your browser.
Console
Simulated browser setup with logs and errors.
Explore our simple pricing
95% percent of our stuff is totally free ..But you can get everything
we’ve put our hands on by Upgrading to the most affordable premium plans
we’ve put our hands on by Upgrading to the most affordable premium plans
Refer a friend and earn 30%
Soon
Free
0$/month
All trivia questions
30 coding challenges
10 UI components
Access to docs & guides
Basic Progress tracking
Free forever
Monthly
9$/month
18$
50% offAll free features
Premium coding challenges
Premium UI components
Access to Figma files
Advanced progress tracking
Private discord channels
Access to Code review (soon)
Annual
5$/month
60$ billed annually
120$
50% offAll free features
Premium coding challenges
Premium UI components
Access to Figma files
Advanced progress tracking
Private discord channels
Access to Code review (soon)
Full support from our team
Have more questions?Reach out to us