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UuByte
Free · No signup · 6 Languages

Learn to code.In every language.

Interactive tutorials in Go, Python, JavaScript, Java, Rust, and C++. Write real code in your browser, get instant feedback, and ace technical interviews.

  • ✓Write real code in your browser — zero setup
  • ✓Instant pass/fail feedback on every step
  • ✓Same concepts taught across all 6 languages
  • ✓Built-in LeetCode-style interview practice
Start for freeInterview practice

6

Languages

19

Topics each

11+

Problems

100%

Free

✓Step passed! +10 XP
🔥3-day streak
hello.go
Step 1 / 5Getting Started

Use fmt.Println() to print "Hello, World!" to the console.

1package main
2.
3import "fmt"
4.
5func main() {
6 fmt.Println("Hello, World!")
7}
◉ Format

Output

Hello, World!✓Correct!
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How it works

Four steps between you and fluency in a new language.

01
📖

Read

Short, focused lessons with clear explanations and real examples.

02
✏️

Code

Edit real code directly in your browser — no installs, no setup.

03
✓

Check

Instant feedback tells you if your output matches the expected result.

04
🏆

Level up

Earn XP, maintain streaks, and track your progress across all languages.

Pick your language

Same concepts, same structure — choose the language you want to master.

🐹

Go

19 lessons

Learn Go programming for free with uByte. Interactive Golang tutorials for beginners — write and run real Go code in your browser. Start today.

Start learning→
🐍

Python

19 lessons

Learn Python programming for free with uByte. Interactive Python tutorials for beginners — write and run real Python code in your browser.

Start learning→
⚙️

C++

19 lessons

Learn C++ programming for free with uByte. Interactive C++ tutorials for beginners — write and run real C++ code in your browser.

Start learning→
🟨

JavaScript

19 lessons

Learn JavaScript programming for free with uByte. Interactive JS tutorials for beginners — write and run real code in your browser.

Start learning→
☕

Java

19 lessons

Learn Java programming for free with uByte. Interactive Java tutorials for beginners — write and run real code in your browser.

Start learning→
🦀

Rust

19 lessons

Learn Rust programming for free with uByte. Interactive Rust tutorials for beginners — write and run real code in your browser.

Start learning→
🎯

Ace your interview

Solve classic problems — Two Sum, LRU Cache, Merge Intervals and more — in any language. Same LeetCode-style IDE, built right in.

  • Two Sumeasy
  • Three Summedium
  • Maximum Subarraymedium
  • Trapping Rain Waterhard
  • Valid Parentheseseasy
  • Climbing Stairseasy
  • + 5 more problems
Browse all problems →
🐹

Go

11 problems

Arrays, hashmaps & goroutines

Start practicing→
🐍

Python

11 problems

Clean syntax, fast prototyping

Start practicing→
🟨

JavaScript

11 problems

Closures, callbacks & async

Start practicing→
☕

Java

11 problems

OOP, generics & collections

Start practicing→
🦀

Rust

11 problems

Ownership, lifetimes & safety

Start practicing→
⚙️

C++

11 problems

Pointers, STL & performance

Start practicing→