What makes a good API for a library? Or more importantly, what makes an API bad?

Implementing an API is an art. It’s the connection between the user and the library itself. How can we optimize that connection to make the experience more pleasing? What makes a user reach for one library over another? What goes into an ergonomic API?

This talk will discuss what makes an API good: simplicity, consistency, and flexibility. We will apply those principles by iterating and improving on a real world example, ending with a library that is delightful to work with.