# map function in Go


There is better stuff in the standard Go release but I wanted to try 
something for myself. In Go, this function is also called `Map()`, but is
(of course) nicer. Anyhow, I'm liking this Go stuff more and more. Next I
want to rewrite the DNS stuff in Go.

    package main

    import (
	    "fmt"
    )

    type e interface{}

    func mult2(f e) e { 
	    switch f.(type) {
	    case int:
		    return f.(int) * 2 
	    case string:
		    return f.(string) + f.(string)
	    }   
	    return f
    }

    func Map(n []e, f func(e) e) {
	    for k, v := range n { 
		    n[k] = f(v)
	    }   
    }

    func main() {
	    m := [...]e{1, 2, 3, 4}
	    s := [...]e{"a", "b", "c", "d"}
	    Map(&m, mult2)
	    Map(&s, mult2)
	    fmt.Printf("%v\n", m)
	    fmt.Printf("%v\n", s)
    }