Variables in Types

September 25, 2017

These are some recitation notes for an ad-hoc recitation I gave for the class 15-312 Principles of Programming Languages. It was probably my favorite 312 recitation content-wise, because it’s the first recitation where we’ve covered enough stuff to where we can really start connecting the dots.

Abstract:

We’ve seen a number of examples in class of types which use variables. Having variables in our type systems lends a great deal of power to languages using these type systems. We’re going to look at how variables are used in generic programming, inductive & coinductive types, and polymorphic types.

Variables in Types

Read More

Prefer .then() over .catch()

When designing asynchronous APIs that could error in Flow, prefer using `.then` for both successful and failure cases. Flow exposes a relatively unsafe library definition for the `.catch` method, so it’s best to avoid it if you can. Continue reading

Union Types in Flow & Reason

Published on April 19, 2018

Case Exhaustiveness in Flow

Published on April 15, 2018