Todos in Ruby

Livecoding video (50 mins)

I livecoded this app for two reasons:

1. To demonstrate some skills that it's important to learn at Makers.
2. To provide some "accidental" learning. Learning at Makers is very self-led. This is great. But there are fewer chances to see the little things that a more experienced developer does without thinking about it. This livecoding might demonstrate a few of those things.

Skills

• TDD.
• Red, green, refactor.
• Object-oriented code design.
• Domain modelling.
• Debugging by tightening the loop and getting visibility.

User stories

As a user
So I can remember the things I need to do
I want to be able to create a todo

As a user
So I can keep track of the things I've done
I want to be able to mark a todo as complete

As a user
So I can see what I need to do
I want to be able to print out all my todos

Next steps

I left the app partly complete. If you'd like to try implementing some more of it yourself, here are some possible next steps:

• I've implemented the first user story. The second and third user stories are undone.
• Improve the tests so they check for more edge cases.
• Refactor Command so the command parsing is done in a separate class.
• Refactor command.dispatch to replace the conditional with some polymorphic code.
• Add a file that listens for user input and passes it to the app.

Scratch area

> new get milk
> print
1. get milk
2. walk the dog
> complete 1

create a todo
complete a todo
print all todos

Todo
Todos