Erlang Pattern matching with aliases

Question

is there a possibility to match in a function definition do some subset of a touple and still get get complete touple in the method ?

What I would like to do is something like this:

myfun({ foo, Bar }: Var) -> otherfunction(Var, stuff).

instead of:

myfun({ foo, Bar }) -> otherfunction({ foo, Bar }, stuff).

I hope this is clear enough.

Thanks.

Answer 1

You can ignore some parameters by putting an underscore in front. E.g.

myfun( {foo, _Bar, Var } )

will match by ignoring the _Bar parameter. Is that what you had in mind?

Or did you mean:

myfun( {foo, Bar} = Var ) -> otherfun( Var ).

in this case, Var will be used in otherfun iff the match with myfun succeeded. The reason is: Var is un-bound at the time of evaluation of the expression and thus will be assigned to {foo, Bar}.