variable of type finger

[Gianmaria Lari]

This code define a variable containing a duration and the use it:

\version "2.19.81"

#(define myDuration (ly:make-duration 4 0))

{ a\myDuration}

I can do something similar wit fingering:

\version "2.19.81"

myFinger = \finger "3"

{ a\myFinger}

How can I rewrite the previous

myFinger = \finger "3"

using a define and the scheme function that create a finger articulation? I hope I have been clear....

Thank you, g.