Move slide on blocks to beginning of control flow section #2598
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I think it'd be good to move the slides on blocks and scopes to the beginning of the control flow section. This allows us to introduce a couple of core concepts that are common to all control flow concepts (returning values from blocks and scoping rules). I think this'll then make it easier for students to understand how to return values from the other control flow constructs. I think the way we currently introduce it with
if/elseis harder for students to understand, and I think the slides on blocks demonstrates it better.This PR currently looks like I'm moving two slides to the beginning of the section, but I also have #2596 up which proposes to remove the shadowing slide, so my goal is to have just a single slide on blocks at the beginning of the control flow section.