Field reference in ruby filter

Is it possible to reference a field inside the ruby filters code?
I have a field with an ID and I would like to create a variable for each of it's values if it has not been created yet, or do something with it, if I already created it.
Something like this:
ruby {
code =>
"if defined? $my_var%{my_ID} == nil
$my_var%{my_ID} = 0;
do stuff with $my_var%{my_ID}

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