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How to trim prefix from the slice of bytes 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 trim prefix from the given slice using TrimPrefix() function. This function returns a subslice of the original slice by slicing off the given leading prefix string. If the given slice of bytes does not contain the specified prefix string, then this function returns the original slice without any change. It is defined under the bytes package so, you have to import bytes package in your program for accessing TrimPrefix function.

Syntax:

func TrimPrefix(ori_slice, pfx []byte) []byte

Here, ori_slice is the original slice of bytes and pfx represents prefix. Let us discuss this concept with the help of the given examples:

Example 1:




// Go program to illustrate the concept of
// trimming prefix in the slice of bytes
package main
  
import (
    "bytes"
    "fmt"
)
  
func main() {
  
    // Creating and trimming the slice of bytes
    // Using TrimPrefix function
    res1 := bytes.TrimPrefix([]byte("****Welcome to GeeksforGeeks****"), 
                                                          []byte("**"))
      
    res2 := bytes.TrimPrefix([]byte("Learning how to trim a slice of bytes"),
                                                            []byte("Learn"))
      
    res3 := bytes.TrimPrefix([]byte("GeeksforGeeks, Geek"), []byte("apple"))
  
    // Display the results
    fmt.Printf("\n\nFinal Slice:\n")
    fmt.Printf("\nSlice 1: %s", res1)
    fmt.Printf("\nSlice 2: %s", res2)
    fmt.Printf("\nSlice 3: %s", res3)
}

Output:



Final Slice:

Slice 1: **Welcome to GeeksforGeeks****
Slice 2: ing how to trim a slice of bytes
Slice 3: GeeksforGeeks, Geek

Example 2:




// Go program to illustrate the concept
// of trimming prefix in the slice of bytes
package main
  
import (
    "bytes"
    "fmt"
)
  
func main() {
  
    // Creating and initializing the slice of bytes
    // Using shorthand declaration
  
    slice_1 := []byte{'!', '!', 'G', 'e', 'e', 'k', 's', 'f', 'o',
                       'r', 'G', 'e', 'e', 'k', 's', '#', '#'}
    slice_2 := []byte{'A', 'p', 'p', 'l', 'e'}
    slice_3 := []byte{'%', 'g', 'e', 'e', 'k', 's', '%'}
  
    // Displaying slices
    fmt.Println("Original Slice:")
    fmt.Printf("Slice 1: %s", slice_1)
    fmt.Printf("\nSlice 2: %s", slice_2)
    fmt.Printf("\nSlice 3: %s", slice_3)
  
    // Trimming specified prefix Unicodes
    // points from the given slice of bytes
    // Using TrimPrefix function
    res1 := bytes.TrimPrefix(slice_1, []byte("!!"))
    res2 := bytes.TrimPrefix(slice_2, []byte("A"))
    res3 := bytes.TrimPrefix(slice_3, []byte("as"))
  
    // Display the results
    fmt.Printf("\n\nNew Slice:\n")
    fmt.Printf("\nSlice 1: %s", res1)
    fmt.Printf("\nSlice 2: %s", res2)
    fmt.Printf("\nSlice 3: %s", res3)
  
}

Output:

Original Slice:
Slice 1: !!GeeksforGeeks##
Slice 2: Apple
Slice 3: %geeks%

New Slice:

Slice 1: GeeksforGeeks##
Slice 2: pple
Slice 3: %geeks%

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