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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