Jest reduced their test runner time by 20% by switching from plain JavaScript objects to Maps where it made sense. https://github.com/facebook/jest/pull/6960 …
In general, don’t be afraid to use modern features! Focus on writing idiomatic code, and let JS engines worry about making it fast.
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Just checking there were no gotchas. It is great to hear this is a universal win for code clarity and runtime performance
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JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.