MasterJavaScriptMethods

Test your might, beat the clock, make a name for yourself.

Why Method Madness?

A game designed for developers at every level

Learn by Doing

Interactive tutorials guide you through each method. Get instant feedback as you type and build muscle memory for real-world coding.

Perfect for beginners

Prove Your Speed

Race against the clock in timed challenges. Test your mastery, compete for high scores, and keep your skills razor-sharp.

Built for experts

Real-World Skills

20+ string methods covering extraction, transformation, search, and more. Everything you need for everyday JavaScript development.

Practical for everyone

Type the correct method chain to transform the input string into the target output

Input:" hello world "

Goal:"HELLO WORLD"

Solution: str.trim().toUpperCase()

Practice real code, get instant feedback, and build muscle memory for interviews and everyday coding.

Climb the ranks in solo play or race friends head-to-head in multiplayer matches.

Time-based rounds + scoring keep you sharp and make practice addictive.

20+ string methods from .slice() to .padEnd()—everything you actually use at work.

Learn the basics with our step-by-step guide, then test your skills in practice mode

Step 1 of 13

Transform the INPUT to match the GOAL. Type str.toUpperCase() and press Enter.

Type:str.toUpperCase()

Input

Goal

"HELLO"

hello

let str = "hello"

str.someMethod()

Press Enter to submit. Use str as the input variable. Type str. then Ctrl+Space for method list.