Enums Exercises

Setup

Fork and clone the enums-exercises repository.

$ cd ~/your/project/dir
$ git clone git@github.com:USERNAME/enums-exercises.git
$ cd enums-exercises

Create a branch so that you're not changing master:

$ git checkout -b make-tests-pass

Solving Exercises

For each method of interest there are two files of interest. Let's look at map as an example:

1. exercises/map_pattern_test.rb
2. exercises/map_test.rb

In the map_pattern_test.rb you'll find a collection of exercises which do what map is good at, but they do it just with each. Then in map_test.rb you'll find the same examples using map.

We recommend you...

• Open your text editor with two panes (left and right)
• In the left pane, open the pattern file like map_pattern_test.rb
• In the right pane, open the matching file like map_test.rb
• Run the map_pattern_test.rb and solve the first exercise
• Run the map_test.rb and solve the same exercise
• Repeat for each matching pair of exercises
• Commit your solutions after finishing each file

Work Order

You'll find the exercises in exercises/ and we recommend working in this order:

• map
• select
• reject
• any?
• all?
• none?
• one?
• group_by
• find
• count
• sort_by
• reduce
• zip

Other exercises

• exercises/find_using_max_by_test.rb
• exercises/basic_enums_test.rb

Create Your Own Adventure

Check out master:

$ git checkout master

Create a new branch:

$ git checkout -b new-exercises

Make up one extra test for each test suite. Remember to delete the implementation once it's passing, and add a skip to it.

$ git diff
$ git add -A
$ git commit -m "Add more exercises"

Push your branch up to GitHub:

$ git push -u origin new-exercises

Submit a pull request (go to the front page of your own enums-exercises repository, there should be a button to compare/create a pull request for the branch that you just pushed up).

Using Other Enumerable Methods

Now go back to your make-tests-pass branch:

$ git checkout make-tests-pass

We will use alternate Enumerable methods to solve the same problems as before:

• map: transform_collections_test.rb
• select: pick_desired_values_test.rb
• reject: filter_unwanted_values_test.rb
• any?: are_there_any_test.rb
• all?: are_they_all_test.rb
• find: find_first_one_test.rb

Keeping in sync with the upstream repository

origin is your fork of the project. We'll need to connect to the upstream repository.

To do this, add a new remote named upstream that points to the JumpstartLab:

$ git remote add upstream git@github.com:JumpstartLab/enums-exercises.git

Then pull down the updated version of upstream:

$ git fetch upstream

And now make sure you're on master:

$ git checkout master
$ git branch # should say *master

Make master point to the exact commit that upstream/master is pointing at:

$ git reset --hard upstream/master

License

The MIT License (MIT)

Copyright (c) 2014 Jumpstart Lab

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.