The contents of a map block should probably be an instance method on each item.
RSpec custom matchers can be written using plain old objects.
Rocket launches show us that we can know that two future events will be simultaneous, or what the local time will be, but not both.
Links to some of the best Elm data modeling resources around the web.
Using #tally to calculate the distribution of letters in a piece of text.
A visual answer to the question “what data is created when I execute this test?”.
Working in small chunks is one of the most impactful things we can do as developers.
What is the correct behavior of hash, ==, eql? and equal? for value objects?
How can we create ranges out of custom objects?
Get better at detecting and preventing bugs by focusing on the boundaries in and around your program.