How Can I Convert a Go Slice to an Array Without Copying?

Converting Slices to Arrays

In Go, converting a slice to an array without copying can be achieved by using a trick or a for loop.

To use the trick, pass the array as a slice to the copy function:

type Lead struct {
  Magic        [4]byte
  Major, Minor byte
  Type         uint16
  Arch         uint16
  Name         string
  OS           uint16
  SigType      uint16
}

lead := Lead{}
copy(lead.Magic[:], buffer[0:4])

Alternatively, a for loop can be used:

for index, b := range buffer[0:4] {
    lead.Magic[index] = b
}

Using literals, a slice can be directly converted to an array:

type Lead struct {
  Magic        [4]byte
  Major, Minor byte
  Type         uint16
  Arch         uint16
  Name         string
  OS           uint16
  SigType      uint16
}

lead := Lead{
  Magic: [4]byte{'h', 'e', 'l', 'l'},
  ...
}

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