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by rapind
1896 days ago
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I agree. I am curious though about how substantial the memory and diffing costs are. I don’t mean that in an I doubt it’s a big deal way, rather I’m genuinely curious and haven’t been able to find any literature on the actual overhead compared to straight up DOM manipulation. I would imagine batching updates to be an advantage of the vdom but only if it’s still that much lighter weight (seeing as you can ignore a ton of stuff from the DOM). |
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There are two separate issues here: one is how well you can avoid updating things which didn't change — for example, at one point I had a big table showing progress for a number of asynchronous operations (hashing + chunked uploads) and the approach I used was saving the appropriate td element in scope so the JavaScript was just doing elem.innerText = x, which is faster than anything which involves regenerating the DOM or updating any other property which the update didn't affect.
The other is how well you can order updates — the DOM doesn't have a batch update concept but what is really critical is not interleaving updates with DOM calls which require it to calculate the layout (e.g. measuring the width or height of an element which depends on what you just updated). You don't necessarily need to batch the updates together logically as long as those reads happen after the updates are completed. A virtual DOM can make that easy but there are other options for queuing them and perhaps doing something like tossing updates into a queue which something like requestAnimationFrame triggers.