Interesting Talk: "Functional Programming with Effects"

I've just watched this wonderful talk by Rob Norris

• Functional Programming with Effects

Interesting Talk: "Domain Invariants & Property-Based Testing for the Masses"

I've just watched this wonderful talk by Romeu Moura

• Domain Invariants & Property-Based Testing for the Masses

Interesting Talk: "Thermodynamics of Software"

I've just watched this very interesting talk by Jérémie Chassaing

• Thermodynamics of Software

Interesting Talk: "Side Effects are a Public API"

I've just watched this very interesting talk by Christopher Armstrong

• Side Effects are a Public API

Kata: Fractions in JavaScript ES5 using the Function as Object pattern

One of the katas I use to start practicing TDD with my mentees is the Fractions kata. This kata is great to practice writing a good list of examples and doing small baby steps. I first learn about it while doing the J. B. Rainsberger wonderful TDD course.

We usually do it in Java, but last week Antonio and I did it in JavaScript ES5 using the Function as Object pattern. This is a very interesting pattern to create objects that you can use in any language with first-class functions and closures. In Codesai we use and teach this pattern when working in projects using ES5.

We had a great time doing this kata in several short sessions that are also helping me in my recovery process.

These are the tests we wrote:

and this is the resulting code:

See all the commits here if you want to follow the process. You can find all the code on this GitHub repo.