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Not sure what you want, but as Ben says there are plug-ins that can simulate many animated "computer code generators". If you saw it in a film, most likely someone has recreated it. Sometimes searching for effect using the movie title may give you a plug-in with the same style effect.
Check out our own forum for "Free FCPX Plugins and Templets" or check out FXFactory, and thousands of other free FCPX plug-in sites.