It's really not. So you are typing Javascript into your browser's console to see what it does instead of a text editor and compiler. The iterative process is

It's really not. So you are typing Javascript into your browser's console to see what it does instead of a text editor and compiler. The iterative process is still very similar. Write code -> get the syntax correct -> see if output matches your mental model -> repeat. You still want unit testing or some other system of reliably testing your code and detecting regressions. You need to use a distributed version control system to track your work over time and collaborate with others. You need to be able to figure out why your code is suddenly taking much longer to execute it than you thought it would. You need to figure out why the memory usage keeps going up and never comes down. You need to be able to gather requirements for the software you are writing. All of those things are skills you need to learn regardless of the specific programming language.