Functions and returns

The essential idea

Functions and returns becomes clear when you identify its job before memorising syntax. In Go, small explicit pieces combine into programs that are easy to read, build, and change.

Run a tiny experiment

Keep the path from source file to compiled program in mind as you learn this part.

func square(n int) int {
  return n * n
}
fmt.Println(square(4))

Output:

16

A useful habit

Do not copy a solution blindly. For Functions and returns, change one value, run go test or go run, and explain why the result changed.

Quick check

Quick check: How should you learn Functions and returns?

• Run one focused example and inspect the result.
• Memorize it without writing code.
• Skip compiler and test feedback.