How to find out element position in slice?

Question

How does one determine the position of an element present in slice?

I need something like the following:

type intSlice []int

func (slice intSlice) p         


        

Answer 1

Another option is to sort the slice using the sort package, then search for the thing you are looking for:

package main

import (
    "sort"
    "log"
    )

var ints = [...]int{74, 59, 238, -784, 9845, 959, 905, 0, 0, 42, 7586, -5467984, 7586}

func main() {
        data := ints
        a := sort.IntSlice(data[0:])
        sort.Sort(a)
        pos := sort.SearchInts(a, -784)
        log.Println("Sorted: ", a)
        log.Println("Found at index ", pos)
}

prints

2009/11/10 23:00:00 Sorted:  [-5467984 -784 0 0 42 59 74 238 905 959 7586 7586 9845]
2009/11/10 23:00:00 Found at index  1

This works for the basic types and you can always implement the sort interface for your own type if you need to work on a slice of other things. See http://golang.org/pkg/sort

Depends on what you are doing though.