Consider diff-style code samples

[tjvr]

It's apparently not clear (who knew?!) that when I provide separate code samples, for example here, that I'm intending you to edit the previous one (rather than add it additionally to the previous one).

It'd be ideal if I could reproduce the previous code but include strikethroughs. Not sure how to do that with Markdown, but perhaps

forever(() => {
//--face.angle += 1--
  face.x += 2
})

would suffice?

Compare with //... for elided sections.

world.on('tap', e => {
  //...[make the bullet]...

  forever(() => {
    bullet.x += 3
    bullet.y += 3
  })
})

[tjvr]

We're now wrapping code blocks in <s>. I think that works fine.

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