FindIndex

func FindIndex[T any](slice []T, predicate func(value T, index int, slice []T) bool) int

FindIndex takes a slice of type T and executes the passed in predicate function for each element in the slice. If the predicate returns true, the element's index is returned. If no element is found, -1 is returned. The function is passed the current element, the current index and the slice itself as function arguments.

package main

import (
    "fmt"
    "strings"

    "github.com/Goldziher/go-utils/sliceutils"
)

func main() {
    days := []string{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}

    result := sliceutils.FindIndex(days, func(value string, index int, slice []string) bool {
        return strings.Contains(value, "Wed")
    })

    fmt.Print(result) // 3
}