How to trim suffix 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 suffix from the given slice using TrimSuffix() function. This function returns a subslice of the original slice by slicing off the given trailing suffix string. If the given slice of bytes does not contain the specified suffix 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 TrimSuffix function. Syntax:

func TrimSuffix(ori_slice, sfx []byte) []byte

Here, ori_slice is the original slice of bytes and sfx represents the suffix. Let us discuss this concept with the help of the given examples: Example 1:

// Go program to illustrate the concept of
// trimming suffix 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 suffix Unicodes
    // points from the given slice of bytes
    // Using TrimSuffix function
    res1 := bytes.TrimSuffix(slice_1, []byte("#"))
    res2 := bytes.TrimSuffix(slice_2, []byte("le"))
    res3 := bytes.TrimSuffix(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: App
Slice 3: %geeks%

Example 2:

// Go program to illustrate the concept of
// trimming suffix in the slice of bytes
package main

import (
    "bytes"
    "fmt"
)

func main() {

    // Creating and trimming
    // the slice of bytes
    // Using TrimSuffix function
    res1 := bytes.TrimSuffix([]byte("****Welcome to GeeksforGeeks****"),
                                                            []byte("*"))
    
    res2 := bytes.TrimSuffix([]byte("Learning how to trim a slice of bytes"),
                                                             []byte("bytes"))
    
    res3 := bytes.TrimSuffix([]byte("GeeksforGeeks, Geek"), []byte("apple"))

    // Display the results
    fmt.Printf("Final 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: Learning how to trim a slice of 
Slice 3: GeeksforGeeks, Geek

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

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