How to convert a double into a byte array in swift?

Question

I know how to do it in java (see here), but I couldn\'t find a swift equivalent for java\'s ByteBuffer, and consequently its .putDouble(double value) method.

Basically,

Answer 1

Solution in swift 3:

public func toByteArray(_ value: T) -> [Byte] {
  let totalBytes = MemoryLayout.size
  var value = value
  return withUnsafePointer(to: &value) { valuePtr in
    return valuePtr.withMemoryRebound(to: Byte.self, capacity: totalBytes) { reboundPtr in
      return Array(UnsafeBufferPointer(start: reboundPtr, count: totalBytes))
    }
  }
}