Probably even better to pick PHP then, large standard library included, open foo.php to code, no main function required, just start writing, no build step, can output to stdout or http without effort
Sure, but it depends on the task. For instance if I need to talk to operating system APIs directly then C (or ObjC on Mac) might still be the better choice. Best tool for the job etc... I guess the gist is that languages that are built around the idea of high level abstractions and enforcing a specific coding style on large teams might not be the best language for exploring and prototyping.