How to join the elements of the byte slice in Golang?

Last Updated : 26 Aug, 2019

In Go language slice is more powerful, flexible, convenient than an array, and is a lightweight data structure. The slice is a variable-length sequence which stores elements of a similar type, you are not allowed to store different type of elements in the same slice.
In the Go slice of bytes, you are allowed to join the elements of the byte slice with the help of Join() function. Or in other words, Join function is used to concatenate the elements of the slice and return a new slice of bytes which contain all these joined elements separated by the given separator. It is defined under the bytes package so, you have to import bytes package in your program for accessing Join function.

Syntax:

func Join(slice_1 [][]byte, sep []byte) []byte

Here, sep is the separator placed between the elements of the resulting slice. Let us discuss this concept with the help of the examples:

Example 1:

// Simple Go program to illustrate 
// how to join a slice of bytes 
package main 
  
import ( 
    "bytes"
    "fmt"
) 
  
// Main function 
func main() { 
  
    // Creating and initializing 
    // slices of bytes 
    // Using shorthand declaration 
    name := [][]byte{[]byte("Sumit"),  
                     []byte("Kumar"),  
                     []byte("Singh")} 
    sep := []byte("-") 
  
    // displaying name of the student in parts 
    fmt.Printf("First Name: %s", name[0]) 
    fmt.Printf("\nMiddle Name: %s", name[1]) 
    fmt.Printf("\nLast Name: %s", name[2]) 
  
    // Join the first, middle, and 
    // last name of the student 
    // Using Join function 
    full_name := bytes.Join(name, sep) 
  
    // Displaying the name of the student 
    fmt.Printf("\n\nFull name of the student: %s", full_name) 
  
} 

Output:

First Name: Sumit
Middle Name: Kumar
Last Name: Singh

Full name of the student: Sumit-Kumar-Singh

Example 2:

// Go program to illustrate how to 
// join the slices of bytes 
package main 
  
import ( 
    "bytes"
    "fmt"
) 
  
// Main function 
func main() { 
  
    // Creating and initializing slices of bytes 
    // Using shorthand declaration 
    slice_1 := [][]byte{[]byte("Geeks"), []byte("for"), []byte("Geeks")} 
      
    slice_2 := [][]byte{[]byte("Hello"), []byte("My"), 
        []byte("name"), []byte("is"), []byte("Bongo")} 
  
    // Displaying slices 
    fmt.Println("Slice(Before):") 
    fmt.Printf("Slice 1: %s ", slice_1) 
    fmt.Printf("\nSlice 2: %s", slice_2) 
  
    // Joining the elements of the slice 
    // Using Join function 
    res1 := bytes.Join(slice_1, []byte(" , ")) 
    res2 := bytes.Join(slice_2, []byte(" * ")) 
    res3 := bytes.Join([][]byte{[]byte("Hey"), []byte("I"),  
              []byte("am"), []byte("Apple")}, []byte("+")) 
  
    // Displaying results 
    fmt.Println("\n\nSlice(after):") 
    fmt.Printf("New Slice_1: %s ", res1) 
    fmt.Printf("\nNew Slice_2: %s", res2) 
    fmt.Printf("\nNew Slice_3: %s", res3) 
  
} 

Output:

Slice(Before):
Slice 1: [Geeks for Geeks] 
Slice 2: [Hello My name is Bongo]

Slice(after):
New Slice_1: Geeks , for , Geeks 
New Slice_2: Hello * My * name * is * Bongo
New Slice_3: Hey+I+am+Apple

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

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How to join the elements of the byte slice in Golang?

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