I programmed the first 10 years of my life in compiled statically typed languages (C, C++, Java, etc), then I needed to start programming in Ruby for production environments and initially I felt "naked"; I felt so insecure when building something and not having it compiling successfully. That's when I really got into Unit Tests, bugs as stupid as "vlue" instead of "value" typos can plague your codebase in languages like javascript, python, ruby, etc; and testing is the only way to find them (other than... in production errors).