Kuidas töötab funktsioon copy Go keeles ja millistel juhtudel on selle kasutamine õigustatud?

In Go, the copy function is used to copy elements from one slice to another. Its signature is:

func copy(dst, src []Type) int

copy copies at least the length of dst and src elements and returns the number of elements copied.

Its use is justified when you need to create a copy of a slice or copy part of the data into another slice, to avoid changing the original data when modifying the new slice.

Example:

src := []int{1, 2, 3, 4}
dst := make([]int, len(src))
count := copy(dst, src)
fmt.Println(dst) // [1 2 3 4]
fmt.Println(count) // 4

This is useful for creating independent copies of slices.