How to trim left-hand side of a 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 trim all the starting UTF-8-encoded code points from the given slice using TrimLeft() function. This function returns a subslice of the original slice by slicing off all the leading UTF-8-encoded code points which are specified in the given string. If the given slice of bytes does not contain the specified string in its left-hand side, 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 TrimLeft function.

Syntax:

func TrimLeft(ori_slice[]byte, cut_string string) []byte

Here, ori_slice is the original slice of bytes and cut_string represent a string which you want to trim in the given slice. Let us discuss this concept with the help of the given examples:



Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Go program to illustrate the concept
// of left trim 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 leading Unicodes 
    // points from the given slice
    // Using TrimLeft function
    res1 := bytes.TrimLeft(slice_1, "!#")
    res2 := bytes.TrimLeft(slice_2, "*")
    res3 := bytes.TrimLeft(slice_3, "@")
  
    // 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)
  
}

chevron_right


Output:

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

New Slice:

Slice 1: GeeksforGeeks##
Slice 2: Apple^^
Slice 3: %geeks%

Example 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

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

chevron_right


Output:

Final Slice:

Slice 1: Welcome to GeeksforGeeks****
Slice 2: Learning how to trim a slice of bytes@@@@
Slice 3: ^^Geek&&


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.