V8 v7.2 / Chrome 72 greatly improves the performance of spread elements of the form [...x] or [...x, y, z]. Here’s how we did it: https://v8.dev/blog/spread-elements …pic.twitter.com/MU2xj0JjMp
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It does, but it also has a benefit: // Pre-allocate the correct number of elements, to avoid // having to grow the array. It’s a trade-off between optimizing array creation itself vs. optimizing operations on the array. More details:https://www.youtube.com/watch?v=m9cTaYI95Zc&t=23m48s …
There's also a.push(...b), but we've found this exceeds stack limits for long arrays. Important for appending arrays in-place. Maybe there should be a new method to have best of both worlds?
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