I think Dart client side development cycle is unmatched. Develop fast with Dart VM and Dartium Browser and deploy as JavaScript anywhere. Kind of a better GWT.

I think Dart client side development cycle is unmatched. Develop fast with Dart VM and Dartium Browser and deploy as JavaScript anywhere. Kind of a better GWT. Language is good. Also they provide a lot of tools. Package manager, nice SDK, Profiler, Debugger, Code Analyzer, Formatter, Tree-Shaker and several editors. VM speed is close to JVM.. Dart is a very good server language as well. they provide nice command line support. You need to give a try and see to decide. But there are places language and tools has not yet matured and community adaptation is still weak.