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Java Input-Output Monad

There is a newer version: 3.0.0-RC2

package jio.console;

import jio.IO;

import java.util.function.BiFunction;
import java.util.function.Function;

class Errors {

  public static final Function> ARGUMENTS_MISSING =
      command -> IO.fail(new InvalidCommand(command,
                                            "You forgot to pass in some argument!")
                        );

  public static final BiFunction> TOO_MANY_ARGUMENTS =
      (n, command) -> IO.fail(new InvalidCommand(command,
                                                 n + " are too many arguments")
                             );
}