Performance matters: the story of a nice JavaScript refactoring

Learn how every little change can make a difference.

05 May 2024

2 mins

Giorgio Boa

FullStack Developer @ Qarik
Microsoft MVP

Days ago I was pleasantly surprised by a contribution that a friend of mine ilteoood made to the Orama repository. The post said:

Performance improved by 5%!

I thought, damn, some good developers were working there at Orama, so who knows how he managed to improve the code so much. In a world where everything runs on the cloud, we must take into consideration that an improvement of this type is not a given Faster calculations mean a reduction in costs and therefore a real advantage for the company.

Over the years I have learned to know myself and I must say that I love to delve into things when the topic interests me. So once again I stopped scrolling through LinkedIn feeds and took the time to check the PR. And I saw some interesting things that still stick with me today, after a few weeks away.

While benchmarks should always be taken with a grain of salt, it is clear in this example that code where the calculation of `.length` is done only once is faster even if the code is really simple.

If I have made you curious about the other changes that the good ilteoood has made, here is the PR

I hope you liked the article, see you next time.

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While benchmarks should always be taken with a grain of salt, it is clear in this example that code where the calculation of .length is done only once is faster even if the code is really simple.

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While benchmarks should always be taken with a grain of salt, it is clear in this example that code where the calculation of `.length` is done only once is faster even if the code is really simple.