Append or Add one slice to another slice in Go (Golang)

Overview

It is also possible to append one slice to another slice. Below is the format for that.

res := append(slice1, slice2...)

Notice ‘…’ after the second slice. ‘…’ is the operator which means that the argument is a variadic parameter. Meaning that during run time slice2 will be expanded to its individual elements which are passed as multiple arguments to the append function.

Program

package main

import "fmt"

func main() {
    numbers1 := []int{1, 2}
    numbers2 := []int{3, 4}
    numbers := append(numbers1, numbers2...)
    fmt.Printf("numbers=%v\n", numbers)
    fmt.Printf("length=%d\n", len(numbers))
    fmt.Printf("capacity=%d\n", cap(numbers))
}

Output

numbers=[1 2 3 4]
length=4
capacity=4

Note: Check out our Golang Advanced Tutorial. The tutorials in this series are elaborative and we have tried to cover all concepts with examples. This tutorial is for those who are looking to gain expertise and a solid understanding of golang – Golang Advance Tutorial

Also if you are interested in understanding how all design patterns can be implemented in Golang. If yes, then this post is for you –All Design Patterns Golang