golang中是否有任何函数会发现值是否在数组中？

forfor

for

There is no ready function for this in the standard library, but this is how easy it is to create one yourself:

func find(what interface{}, where []interface{}) (idx int) {
    for i, v := range where {
        if v == what {
            return i
        }
    }
    return -1
}

And using it:

what := 10
where := []interface{}{1, 2, 3, 10, 5}
fmt.Println(find(what, where))

Output (try it on the Go Playground):

3

[]int[]interface{}

func find(what int, where []int) (idx int) {
    for i, v := range where {
        if v == what {
            return i
        }
    }
    return -1
}

And then using it:

what := 10
where := []int{1, 2, 3, 10, 5}
fmt.Println(find(what, where))

Output is the same. Try this one on the Go Playground.

interface{}for

for

func find(what int, where []int) (idx int) {
    if len(where) == 0 {
        return -1
    }
    if what == where[0] {
        return 0
    }
    if idx = find(what, where[1:]); idx < 0 {
        return -1 // Not found in the rest of the slice
    }
    return 1 + idx
}

Try this one on the Go Playground.