How to replace a specified element 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 a specified element in the given slice using the Replace() functions. This function returns a copy of the slice that contains a new slice which is created by replacing the elements in the old 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 m-rune slice. And if the value of the m is less than zero, then this function can replace any number of elements in the given slice (without any limit). It is defined under the bytes package so, you have to import bytes package in your program for accessing Repeat function.

Syntax:

func Replace(ori_slice, old_slice, new_slice []byte, m int) []byte

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



Example 1:

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// Go program to illustrate how to replace
// the element 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', 'E', 'E', 'K', 'S'}
    slice_2 := []byte{'A', 'P', 'P', 'L', '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 Replace function
    res1 := bytes.Replace(slice_1, []byte("E"), []byte("e"), 2)
    res2 := bytes.Replace(slice_2, []byte("P"), []byte("p"), 1)
  
    // 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: GEEKS
Slice 2: APPLE

New Slice:
Slice 1: GeeKS
Slice 2: ApPLE

Example 2:

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// Go program to illustrate how to replace
// the specified element from the given
// slice of bytes
package main
  
import (
    "bytes"
    "fmt"
)
  
// Main function
func main() {
  
    // Replacing the element
    // of the given slices
    // Using Replace function
    res1 := bytes.Replace([]byte("GeeksforGeeks, Geeks, Geeks"), []byte("eks"), []byte("EKS"), 3)
  
    res2 := bytes.Replace([]byte("Hello! i am Puppy, Puppy, Puppy"), []byte("upp"), []byte("ISL"), 2)
  
    res3 := bytes.Replace([]byte("GFG, GFG, GFG"), []byte("GFG"), []byte("geeks"), -1)
  
    res4 := bytes.Replace([]byte("I like icecream"), []byte("like"), []byte("love"), 0)
  
    // 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, Puppy
Result 3:geeks, geeks, geeks
Result 4:I like icecream


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