Ian,
thanks for the "generic" function. I appreciate.
I think such a function would provide beautiful symmetry to the already
existing "append" function Go has.
Martin
On Wednesday, August 9, 2017 at 5:53:45 PM UTC+2, Ian Lance Taylor wrote:
>
> Here is a generic Find function that works for all types, using the
> language defined == operator. It will panic if invoked incorrectly.
>
> package main
>
> import (
> "fmt"
> "math"
> "reflect"
> )
>
> // Find returns the index of val in the slice s, or -1 if not found.
> func Find(s, val interface{}) int {
> sv := reflect.ValueOf(s)
> l := sv.Len()
> for i := 0; i < l; i++ {
> if sv.Index(i).Interface() == val {
> return i
> }
> }
> return -1
> }
>
> var tests = []struct {
> s, v interface{}
> want int
> }{
> {[]int{1, 2, 3}, 2, 1},
> {[]int{1, 2, 3}, 4, -1},
> {[]string{"a", "b"}, "a", 0},
> {[]float64{0, 1, math.NaN(), 2}, 2.0, 3},
> {[]float64{0, 1, math.NaN(), 2}, math.NaN(), -1},
> }
>
> func main() {
> for _, t := range tests {
> if got := Find(t.s, t.v); got != t.want {
> fmt.Printf("Find(%v, %v) = %d, want %d\n",
> t.s, t.v, got, t.want)
> }
> }
> }
>
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