Functional play time

gistfile1.txt

package main

import "fmt"

type II interface{}

func mapper (collection [] II,fn func(II) II) [] II  {
  mapped := make([] II,0)
  for _,v := range(collection){
    mapped = append(mapped,fn(v))
  }
  return mapped
}

func fold(collection [] II, accum II, fn func(II, II) II) II {
   
  for _,v := range(collection){
    accum = fn(v,accum)
  }
  return accum
}
  
func main(){

  // Test collection of integers
  var coll_int = [] II {2,4,3,2,9}
  var f_add1 = func(x II) II{
    return x.(int) + 1
  }

  fmt.Println(mapper(coll_int,f_add1))

  // Test collection of integers
  var coll_string = [] II {"a","b","c","d"}
  var f_concat_x = func(x II) II{
    return x.(string) + "x"
  }

  fmt.Println(mapper(coll_string,f_concat_x))

  // Fold of an integer collection
  var f_sum = func(i II, accum II) II{
    return accum.(int) + i.(int) 
  }
  fmt.Println(fold(coll_int,0,f_sum))
}

GO without loops