Concatenate Two Slices

In Go, you can concatenate two slices to create a new slice that contains elements from both original slices.

Using Append

The append() function in Go is a flexible way to concatenate slices. It takes the destination slice followed by the elements to be appended and returns a new slice with the concatenated elements.

Example

package main

import "fmt"

func main() {
    slice1 := []int{1, 2, 3}
    slice2 := []int{4, 5, 6}

    concatenated := append(slice1, slice2...)
    fmt.Println(concatenated)
}

In this example, slice1 and slice2 are concatenated using the append() function with ... to unpack the elements of slice2 into individual arguments.

Using a Loop

If you want to concatenate slices without modifying the original slices, you can use a loop to copy the elements into a new slice.

Example

package main

import "fmt"

func main() {
    slice1 := []string{"apple", "banana", "orange"}
    slice2 := []string{"grape", "kiwi"}

    concatenated := make([]string, len(slice1)+len(slice2))
    copy(concatenated, slice1)
    copy(concatenated[len(slice1):], slice2)

    fmt.Println(concatenated)
}

In this example, a new slice concatenated is created with enough capacity to hold all elements from both slice1 and slice2. The copy() function is then used to copy the elements from both slices into the new concatenated slice.