S2JS

What if you don't already know Scratch?

Scratch is awesome. It's certainly possible to use S2JS is you haven't done coding in Scratch as long as you've used other ('proper') programming tools that involve "loops" and "if-then-else" and "variables". If you've never heard of these things, then head on over to Scratch and start learning how to code. When Scratch is starting to feel a little tight around the armpits, come back here.

What age groups is S2JS appropriate for ?

It's not so much about age, but about how much Scratching you've done. You need to be very comfortable making sprites move around and using variables. You should be a master of repeat and if-then-else blocks, and it would be great (but not essential) if you know about cloning and "make a block".

Does it matter if I skip around the tutorial sections ?

Pretty much does. The sections are constructed with a careful flow - the coding introduced in one section will be used in the next section as a basis to introduce another new thing. If you skip around, you may find yourself feeling a bit lost. Even if you've done some Javascript before, we'd recommend you follow the lesson flow.

How many programs / images can we store ?

As many until it gets unwieldy for you - which is possibly a dozen or so.

Can we use S2JS in our coding class or club ?

Yes, please do. In fact, that seems to be where S2JS works best. Many providers use a Flipped Classroom approach, where kids work through the S2JS tutorials, and the teacher roams the room providing custom one-on-one assistance as required.