factorial algorithms opposite languages

i wish opposite ways adult with, factorial subroutine, program. wish anyone here competence wish learn new language.

ideas:

• procedural


• functional


• object oriented


• one liners


• obfuscated


• oddball


• bad code


• polyglot

basically i wish an example, opposite ways minute an algorithm, feeling opposite languages.

please border instance per entry.
i grant have some-more instance per answer, perplexing rhythm specific style, language, only good guess out thought lends itself being post.

the wholly genuine requirement contingency factorial given argument, languages represented.

be creative!

recommended guideline:

# libel name: discretionary impression type

   - discretionary bullet points

    formula goes here

other informational calm goes here

i ocasionally along correct any answer does have decent formatting.