Every recursive function should have an exit criterion (=handling the base case) to exit the recursion.
Without it, it wil recurse forever, until system resources run out (typically the call stack will overflow and your program will crash).
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Experiments. ...
Surveys. ...
Questionnaires. ...
Interviews. ...
Case studies. ...
Participant and non-participant observation. ...
Observational trials. ...
Studies using the Delphi method.
See, one is more or less a toy, designed for writing small pieces of code and traditionally used and abused by inexperienced programmers.
The other is a scripting language for web browsers. Sorry about my limited knowledge.
