David Buck questions

David Buck answers

• Visualworks Cincom Smalltalk SUnit Test case for error condition
• extract a substring from a string in smalltalk (squeak)
• Adding collections from different instances
• When to use interfaces in Dart?
• Why do methods return "self" by default in Smalltalk?
• Generating a set of permutation given a set of numbers and some conditions on the relative positions of the elements
• How should I approach wrapping the Composite pattern into the Builder pattern?
• smalltalk reflection - how to get method name?
• Interception messages in Squeak
• How do I create UK dates from strings in Pharo Smalltalk?