## So, suppose we have a platformer character with one-way platforms, cancelable wall slides

SketchSystems.spec

## So, suppose we have a platformer character with one-way platforms, cancelable wall slides
Platform Collisions
  
  On A Platform
    ## To jump, set the vertical velocity to JUMP_START
    jump -> Going Up
    walk off edge -> Falling
  Airborne
    collide with wall? -> Wallslide
    Going Up
      reach apex? -> Falling
      hit ceiling? -> Falling
      pass through one-way platform? -> Going Up
    Falling
      collide with platform? -> On A Platform
  Wallslide
    cancel -> Falling
    jump -> Going Up
    reach bottom? -> At Bottom Of Wall?
  At Bottom Of Wall?
    platform? -> On A Platform
    no platform? -> Falling

SketchSystems_prototype.js

function render(model){
  let current_state_name = model.active_states[0].name;
  return $("h1",
           {style: {color: "darkBlue"}},
           `The current state is: ${current_state_name}`);
}