a side-by-side reference sheet grammar and invocation | variables and expressions | arithmetic and logic | strings | regexes | dates and time | lists | tuples | dictionaries | algebraic data types | functions | execution control | file handles | files | directories | processes and environment | libraries and namespaces | reflection | repl prolog erlang elixir version used SWI Prolog 7.2 8.0 1.3 show version $ swipl --version $ erl -version $ elixir -v grammar and invocation prolog erlang elixir ...