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How to remove the last item from a slice in Golang

Yashaswini Kamatham

Overview

In this shot, we will learn to remove the last item from a slice in Golang.

Slice is a dynamically sized array in Golang:

  • It can grow and shrink when we add or remove elements from it.
  • Can only contain similar types of elements.
  • Declaring a slice is the same as an array but without a size.

Example:

_n_ := []int{1, 2, 3, 4, 5, 6, 7}

Removing last element from a slice

Example

We will remove the last item from a given slice:

{1,2,3,4,5,6,7}

The last item is 77 here.

We will follow the below approach to remove the last item:

  • Calculate the length of the slice
  • Re-slice the original slice to last before element

Code

package main

//import format package
import(
  "fmt"
)

//main program
func main(){

  //Declare slice
  n := []int{1, 2, 3, 4, 5, 6, 7}

  //check if slice is not empty
  if len(n) > 0 {

    //Re-slice to last before element
    n = n[:len(n)-1]
  }

  //display slice where last element is removed
  fmt.Println(n)


}

Explanation

  • Line 9: We have the main() function that is the start of the program execution.
  • Line 12: We declare and initialize slice n.
  • Line 15: We check for a non-empty slice, otherwise if we try to reslice an empty slice it will throw an error.
  • Line 18: We reslice the original slice to the second last element. We find out the second last element by subtracting 1 from the length of the slice.
  • Line 22: We display the slice after removing the last element.

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