How Can I Convert a Slice to an Array in Go?

Converting Slices to Arrays in Go

While attempting to develop an RPM file reader, you may encounter the need to assign a slice to an array field in a struct. This can be a tricky task in Go, as there is no built-in method for direct conversion.

To work around this limitation, consider the following options:

Using copy with a Slice Pretense:

The copy method can be tricked into copying a slice to an array by creating a temporary slice with the same underlying array as the target array.

varLead := Lead{}
magicSlice := someSlice[0:4] // Create a temporary slice that references the array underlying the array field
copy(varLead.Magic[:], magicSlice)

Manual Loop-Based Assignment:

Alternatively, you can loop over the slice and manually assign each element to the corresponding array element.

for index, b := range someSlice {

    varLead.Magic[index] = b

}

Literal Conversion:

If the array size is fixed, you can use literal values to initialize the array directly.

type Lead struct {
  Magic [4]byte
  // Other fields...
}
lead := Lead{
  Magic: [4]byte{0x12, 0x34, 0x56, 0x78},
}

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