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A comment on Using const/let instead of var can make JavaScript code run 10× slower in Webkit. Parent comment

Re:Using const/let instead of var can make JavaScript code r... by DougBTX on Wednesday October 21, 2020 @06:45AM (#24846504)
That very much depends on how good the JIT is, certainly many AOT compilers would understand this pattern and inline the callback, resulting in very similar optimised code.
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