strings.IndexByte() Function in Golang

IndexByte() is an inbuilt function of strings package in Golang. This function returns the index of the first occurrence of a character in a given string. If the character is found, then it returns its index, starting from 0; else it returns "-1".

Syntax

func IndexByte(str string, chr byte) int

Where,

• str – It is the original string.
• chr – Character (byte) to be checked in the string.

Example 1

Let us consider the following example −

package main
import (
   "fmt"
   "strings"
)
func main() {
   // Initializing the Strings
   m := "IndexByte String Function"
   n := "Golang IndexByte String Package"
   
   // Display the Strings
   fmt.Println("First String:", m)
   fmt.Println("Second String:", n)

   // Using the IndexByte Function
   output1 := strings.IndexByte(m, 'g')
   output2 := strings.IndexByte(m, 'r')
   output3 := strings.IndexByte(n, 'E')
   output4 := strings.IndexByte(n, '4')

   // Display the IndexByte Output
   fmt.Println("IndexByte of 'g' in the First String:", output1)
   fmt.Println("IndexByte of 'r' in the First String:", output2)
   fmt.Println("IndexByte of 'E' in the Second String:", output3)
   fmt.Println("IndexByte of '4' in the Second String:", output4)
}

Output

On execution, it will generate the following output −

First String: IndexByte String Function
Second String: Golang IndexByte String Package
IndexByte of 'g' in the First String: 15
IndexByte of 'r' in the First String: 12
IndexByte of 'E' in the Second String: -1
IndexByte of '4' in the Second String: -1

Example 2

Let's take another example −

package main
import (
   "fmt"
   "strings"
)
func main() {
   // Defining the Variables
   var s string
   var cbyte byte
   var result int
   
   // Intializing the Strings
   s = "IndexByte String Function"
   cbyte = 'B'
   
   // Display the Input String
   fmt.Println("Given String:", s)
   
   // Using the IndexByte Function
   result = strings.IndexByte(s, cbyte)
   
   // Output of IndexByte
   fmt.Println("IndexByte of 'B' in the Given String:", result)
}

Output

It will generate the following output −

Given String: IndexByte String Function
IndexByte of 'B' in the Given String: 5