Smalltalk had one of the first implementations of the Observer design pattern. Over the years, Visualworks Smalltalk has had several different implementations of this pattern, from the original #changed/#update approach, to #triggerEvent:, to Announcements.

I regularly listen to the EntreLeadership Podcast, and I highly recommend it.

For the past ten weeks, I’ve been writing about Affordances and Programming Languages.

I previously released DoubleAgents, a test-double library for Visualworks Smalltalk.

I have just released Threequals, which provides a Ruby-like #=== operator for Visualworks Smalltalk.

This post is part of an ongoing series about Affordances and Programming Languages.

This post is part of an ongoing series about Affordances and Programming Languages.

This post is part of an ongoing series about Affordances and Programming Languages.

This post is part of an ongoing series about Affordances and Programming Languages.

I have just released the newest version of SmalltalkFit, a Visualworks Smalltalk implementation of Ward Cunningham’s Framework for Integrated Tests, Fitnesse, and Rick Mugridge’s FitLibrary.