How to replace all the elements in slice of bytes in Golang?

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 replace all the elements in the given slice using the ReplaceAll() functions. This function is used to replace all the elements of the old slice with a new slice. If the given old slice is empty, then it matches at the start of the slice and after each UTF-8 sequence it is yielding up to m+1 replacement for the m-rune string. It is defined under the bytes package so, you have to import bytes package in your program for accessing RepeatAll function.

Syntax:

func ReplaceAll(ori_slice, old_slice, new_slice []byte) []byte

Here, ori_slice is the original slice of bytes, old_slice is the slice which you want to replace, and new_slice is the new slice which replaces the old_slice.



Example 1:

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// Go program to illustrate how to replace all
// the specified elements of the slice of bytes
package main
  
import (
    "bytes"
    "fmt"
)
  
// Main function
func main() {
  
    // Creating and initializing
    // the slice of bytes
    // Using shorthand declaration
    slice_1 := []byte{'G', 'G', 'G', 'E',
       'E', 'E', 'E', 'K', 'S', 'S', 'S'}
      
    slice_2 := []byte{'A', 'A', 'P'
           'P', 'P', 'L', 'E', 'E'}
  
    // Displaying slices
    fmt.Println("Original slice:")
    fmt.Printf("Slice 1: %s", slice_1)
    fmt.Printf("\nSlice 2: %s", slice_2)
  
    // Replacing the element 
    // of the given slices
    // Using ReplaceAll function
    res1 := bytes.ReplaceAll(slice_1, []byte("E"), []byte("e"))
    res2 := bytes.ReplaceAll(slice_2, []byte("P"), []byte("p"))
  
    // Display the results
    fmt.Printf("\n\nNew Slice:")
    fmt.Printf("\nSlice 1: %s", res1)
    fmt.Printf("\nSlice 2: %s", res2)
}

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Output:

Original slice:
Slice 1: GGGEEEEKSSS
Slice 2: AAPPPLEE

New Slice:
Slice 1: GGGeeeeKSSS
Slice 2: AApppLEE

Example 2:

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// Go program to illustrate how to replace all
// the specified elements from the given
// slice of bytes
package main
  
import (
    "bytes"
    "fmt"
)
  
// Main function
func main() {
  
    // Replacing the element
    // of the given slices
    // Using ReplaceAll function
    res1 := bytes.ReplaceAll([]byte("GeeksforGeeks, Geeks, Geeks"), []byte("eks"), []byte("EKS"))
    res2 := bytes.ReplaceAll([]byte("Hello! i am Puppy, Puppy, Puppy"), []byte("upp"), []byte("ISL"))
    res3 := bytes.ReplaceAll([]byte("GFG, GFG, GFG"), []byte("GFG"), []byte("geeks"))
    res4 := bytes.ReplaceAll([]byte("I like like icecream"), []byte("like"), []byte("love"))
  
    // Display the results
    fmt.Printf("Result 1: %s", res1)
    fmt.Printf("\nResult 2: %s", res2)
    fmt.Printf("\nResult 3: %s", res3)
    fmt.Printf("\nResult 4: %s", res4)
}

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Output:

Result 1: GeEKSforGeEKS, GeEKS, GeEKS
Result 2: Hello! i am PISLy, PISLy, PISLy
Result 3: geeks, geeks, geeks
Result 4: I love love icecream


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