exercism fetch factor two-fer

Two Fer

Two-fer or 2-fer is short for two for one. One for you and one for me.

"One for X, one for me."

When X is a name or "you".

If the given name is "Alice", the result should be "One for Alice, one for me." If no name is given, the result should be "One for you, one for me."

Test-Driven Development

As programmers mature, they eventually want to test their code.

Here at Exercism we simulate Test-Driven Development (TDD), where you write your tests before writing any functionality. The simulation comes in the form of a pre-written test suite, which will signal that you have solved the problem.

It will also provide you with a safety net to explore other solutions without breaking the functionality.

A typical TDD workflow on Exercism:

  1. Run the test file and pick one test that's failing.
  2. Write some code to fix the test you picked.
  3. Re-run the tests to confirm the test is now passing.
  4. Repeat from step 1.
  5. Submit your solution (exercism submit /path/to/file)


Submissions are encouraged to be general, within reason. Having said that, it's also important not to over-engineer a solution.

It's important to remember that the goal is to make code as expressive and readable as we can.

Testing Exercises

If you followed the installation instructions, just run the provided test suite against your implementation with "exercise-name" test.

Submitting Exercises

Note that, when trying to submit an exercise, make sure the solution is in the exercism/factor/exercise-name directory.

For example, if you're submitting bob.factor for the Bob exercise, the submit command would be something like exercism submit exercism/factor/bob/bob.factor.

For more detailed information about running tests, code style and linting, please see the help page.


This is an exercise to introduce users to basic programming constructs, just after hello World. https://en.wikipedia.org/wiki/Two-fer

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.