Function run

Try a parser. Here are some examples using the keyword parser:

  run(keyword("true"))("true")  // => Ok ()
  run(keyword("true"))("True")  // => Err ...
  run(keyword("true"))("false") // => Err ...
  run(keyword("true"))("true!") // => Ok ()

Notice the last case! A Parser will chomp as much as possible and not worry about the rest. Use the end parser to ensure you made it to the end of the string!