Just a few additional comments.
The reason I'm so strongly for this approach vs DOM mutation is that there are
huge benefits to the transparency of interpolation generators. At any step of
the process, there is the opportunity to introduce arbitrary control flow based
on the output of the generator.
For example, say you want to transition width from 0 to 100. Easy enough in
jquery syntax, just get your element.animate({width: 100}, 500, callback); Now
what if you want to transition the height to 100 starting halfway through the
animation. Okay, well delay and then start it and run twice as fast. Now what
if I want to start the height animation when width > 60. What about more
complicated criteria?
If you're animation by transitioning state using values coming out of a
generator, you can introduce arbitrarily complex control flow around
animations. For example, you could check at every step of the animation if some
condition is satisfied or else cancel the animation. Or following the above
example, you could transition a value, and then trigger another transition when
it crosses a certain threshold. etc. etc.
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