copy

copy() copies the elements of slice into another slice.

copy(slice1, slice2)

slice1 is the destination slice. slice2 is the source slice.

The element types of the slices should be identical.

package main

import (
	"fmt"

	s "github.com/inancgumus/prettyslice"
)

func main() {
	evens := []int{2, 4}
	odds := []int{3, 5, 7}

	s.Show("evens [before]", evens)
	s.Show("odds  [before]", odds)

	N := copy(evens, odds)
	fmt.Printf("%d element(s) are copied.\n", N) // 2 elements are copied

	s.Show("evens [after]", evens) // even [after] {3, 5}
	s.Show("odds  [after]", odds) // odd [after] {3, 5, 7}
}

The copy() function returns the number of elements it copies.