Slice Pointer and copy slice

---

• Assigning a slices assigns the reference to the slice, to the same place in memory.
• However if we then change one of the variables (e.g. enlarge it), it might be moved to another array and then the two get separated.
• If we assign a pointer to the slices, that pointer goes to the "head of the slice" which is moved when we move the slice.

examples/slice-pointer/slice_pointer.go

package main

import (
    "fmt"
)

func main() {
    a := []string{"Foo", "Bar"}
    b := a
    c := &a
    d := make([]string, len(a))
    copy(d, a)
    fmt.Println(a)
    fmt.Println(b)
    fmt.Println(c)
    fmt.Println(d)
    fmt.Println()

    a[0] = "Zorg"
    fmt.Println(a)
    fmt.Println(b)
    fmt.Println(c)
    fmt.Println(d)
    fmt.Println()

    a = append(a, "Other")
    fmt.Println(a)
    fmt.Println(b)
    fmt.Println(c)
    fmt.Println(d)

}

[Foo Bar]
[Foo Bar]
&[Foo Bar]
[Foo Bar]

[Zorg Bar]
[Zorg Bar]
&[Zorg Bar]
[Foo Bar]

[Zorg Bar Other]
[Zorg Bar]
&[Zorg Bar Other]
[Foo Bar]