How to find the last index value in slice of bytes in Golang?

In Go, a slice is a flexible data structure that stores a variable-length sequence of elements of the same type. The LastIndex() function from the bytes package returns the last index of a specified value in a byte slice, or -1 if the value is not found.

Example

package main
import (
	"bytes"
	"fmt"
)
func main() {
	// Define the slice of bytes
	slice := []byte("GeeksforGeeks, Learning Go")
	
	// Define the byte to search for
	searchByte := []byte("e")

	// Find the last index of the specified byte
	lastIndex := bytes.LastIndex(slice, searchByte)

	// Display the result
	fmt.Printf("\n", searchByte, lastIndex)
}

Syntax

func LastIndex(ori_slice, sep_ []byte) int                  # Using the bytes.LastIndex Function

Using the bytes.LastIndex Function

The simplest way to find the last index of a specified byte slice is to use the LastIndex function from the bytes package.

package main
import (
    "bytes"
    "fmt"
)

func main() {
    originalSlice := []byte("Welcome to GeeksforGeeks")
    searchSlice := []byte("ks")

    lastIndex := bytes.LastIndex(originalSlice, searchSlice)
    fmt.Printf("%s: %d\n", searchSlice, lastIndex)
}

ks: 22

Other method's: