How Can I Find the Position of an Element in a Go Slice?

Finding Element Positions in Slices

Determining an element's position within a slice in Go is not accommodated by a generic library function. Go's language design lacks a straightforward approach for defining a function applicable to any slice type.

Custom Implementation

You can define your own function, as shown in the code sample you provided, to achieve this task:

type intSlice []int

func (slice intSlice) pos(value int) int {
    for p, v := range slice {
        if v == value {
            return p
        }
    }
    return -1
}

This function iterates through the slice, comparing each element to the specified value. If the value is found, its position is returned; otherwise, -1 is returned.

While this function is functional, a minor improvement could be made by using the shorter range syntax:

func (slice intSlice) pos(value int) int {
    for i, v := range slice {
        if v == value {
            return i
        }
    }
    return -1
}

Alternative for Byte Slices

If your slice contains byte elements, the bytes.IndexByte function can be used to find the position of a specific byte value. Its syntax is as follows:

func IndexByte(s \[\]byte, c byte) int

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