A few questions about ENUM

I am a bit confused about the use of enum in Haxe.
I am trying to translate this Java enum to Haxe.

public enum TransportProtocol {

  private final String asString;

  TransportProtocol(String asString) {
    this.asString = asString;

  public String asString() {
    return asString;

I think I have to distinguish between enum types and enum constructors.

enum TransportProtocol {

I´m not sure how to add custom values.
Or how do I implement the constructor and the “asString” function.

Thank you

You can use enum abstracts Enum abstracts - Haxe - The Cross-platform Toolkit

enum abstract TransportProtocol(String) 
  var TCP = "tcp";
  var INPROC = "inproc";
  var IPC = "ipc";
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Oh, apparently, I missed that link. Thanks a lot.

And with custom:

@:enum abstract TransportProtocol(String) 
  var TCP = "tcp";
  var INPROC = "inproc";
  var IPC = "ipc";
  private inline function new(val: String)
      this = val;
  public static function CUSTOM(val: String): TransportProtocol
      return new TransportProtocol(val);


 var pr1 = TransportProtocol.CUSTOM("http");
 var pr2 = TransportProtocol.TCP;
 trace(pr1, pr2);

Can I ask a question about the solution ?
What is the benefit to use an @;enum abstract in such a case ?
I regularly use normal Enum, by example.

Enum TransportProtocol
   CUSTOM( _s:String );

I suppose enum abstracts have no the enum runtime overhead.

The main advantage in this case is that each enum value has a defined string value, which @Bifi seems to need for his asString() function .

I see.
Thanks @alex_dja and @Gama11 !
And I guess, so it brings :
• readibility of internal data, no check of the switched enum parameter to retrieve his value.
• readibility of externalized data.
• versatility in updating our enum with new value or changing their former order by example ?

But aren’t we losing a lot of performance while switching enum between an integer ID and a litteral one ?

For example in js target, the generated enum is a quiet complicated object:

var TransportProtocol = { __ename__ : true, __constructs__ : ["TCP","INPROC","IPC","CUSTOM"] };
TransportProtocol.TCP = ["TCP",0];
TransportProtocol.TCP.toString = $estr;
TransportProtocol.TCP.__enum__ = TransportProtocol;
TransportProtocol.INPROC = ["INPROC",1];
TransportProtocol.INPROC.toString = $estr;
TransportProtocol.INPROC.__enum__ = TransportProtocol;
TransportProtocol.IPC = ["IPC",2];
TransportProtocol.IPC.toString = $estr;
TransportProtocol.IPC.__enum__ = TransportProtocol;
TransportProtocol.CUSTOM = function(_s) { var $x = ["CUSTOM",3,_s]; $x.__enum__ = TransportProtocol; $x.toString = $estr; return $x; };
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