Go30daysOfCode Hacker Rank challenge: 30 days of Go code. Day 0 - Hello World Day 1 - Data types Day 2 - Arithmetic operations Day 3 - Conditional statements Day 4 - Go Methods Day 5 - Loops Day 6 - Review Day 7 - Arrays Day 8 - Maps Day 9 - Recursion Day 10 - Binary numbers Day 11 - 2D Arrays