TypeScript and Dart designers compare their approaches to JavaScript

HN points to it as a rare side-by-side of the TypeScript and Dart designers, often to show how the two approaches to improving JavaScript differed.

A Channel 9 conversation recorded at GOTO 2012 between Anders Hejlsberg (TypeScript) and Lars Bak (Dart). They discuss the two languages and different approaches to making JavaScript development safer, including runtime type checking.