DBC on the benchmarking side
One important difference is that %StringBuilderConcat builds Sequential
string
while optimization builds cons string.
Hence benchmarks that don't account for this difference are not completely
representative: you would pay the cost of flattening at use sites, instead
of
paying it at definition site.
If benchmark has no uses of the String.prototype.repeat result then the most
effective implementation of repeat is the one that is capable of DCEing
it :)
https://codereview.chromium.org/401783003/
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