ruby_map_demo.go

package main
import "fmt"
import "strings"
// some ruby #map type things, in golang
// mostly taken from https://groups.google.com/forum/#!topic/golang-nuts/fgaeXCUEPC4

// apparently calling this out with specific types is faster than defining it generically to use interfaces: http://comments.gmane.org/gmane.comp.lang.go.general/43076

func _map(coll []string, f func(string) string) []string {
      var newColl = make([]string, len(coll))
      for i, s := range coll {
          newColl[i] = f(s)
      }
      return newColl
}

func main() {

  // map
  array := []string{"a", "b", "c"}
  array2 := make([]string, len(array))
  for i, s := range array { array2[i] = strings.ToUpper(s) }
  fmt.Println(array2)

  // map!
  array = []string{"a", "b", "c"}
  for i, s := range array { array2[i] = strings.ToUpper(s) }
  fmt.Println(array2)

  // local map method
  array = []string{"a", "b", "c"}
  array2 = _map(array, strings.ToUpper)
  fmt.Println(array2)
  
}