No. With dynamic languages, one gets not only "reduced" build times, they are instant. Testing for correctness needs to be done with any kind of language. Type

No. With dynamic languages, one gets not only "reduced" build times, they are instant. Testing for correctness needs to be done with any kind of language. Type checking is not a replacement for that. But you can add the necessary type declarations to dynamic language to facilitate static type checking if desired. These checks don't influence the build time significantly. As written in my first post, using dynamic languages is only one way of improving development times. The other of course is, use languages which allow for fast compilation.