Copy and Movement 1

copy.go

src := []int{1, 2, 3, 4, 5}
dst := make([]int, 5)

// copy from slice to slice
copied := copy(dst, src)
// copied: 5
// dst: [1 2 3 4 5]

// copy from string to slice
var b = make([]byte, 5)
copy(b, "Hello, world!") 
// b == []byte("Hello")