By Day:
- Day 1 in Kotlin
- Day 2 in Kotlin
- Day 3 in Kotlin
- Day 4 in Go (golang)
- Day 5 in Ruby
- Day 6 in Ruby
- Day 7 in JavaScript
- Day 8 in Python
- Day 9 in JavaScript
- Day 10 in TypeScript
- Day 11 in Rust
- Day 12 in TypeScript
- Day 13 in Rust
By Lang (alphabetically):