Learning Functional Programming in Go

The AmPmMapper function

This is the mapper we apply when we want to change from AM to PM hours. It will be passed to the Map method and applied to each hour contained in the box. It converts an AM hour (1, 2...12) to its corresponding PM hour (13, 14..0).

var AmPmMapper = func(i int) int {   return (i + 12) % 24}