Use Maps instead of Objects for better performance

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#javascript #performance #webdev #webperformance
  1. Steve (Builder.io)
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Комментарии
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what if you are just adding keys, will the performance still be better?

anonymousBl
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Object.create(null) will make a completely empty object.

PauloSantosk
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Just a quick note: A substantial disadvantage for Maps is that they are not supported with JSON directly.

vicitacious
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But how you can load maps from json file or rest api response?

TarekFaham
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Note: objects are perfectly fine. Map() is half baked and needs some extra TLC in the API.

for...in doesn't work for Maps and wont error out if used. for...of is an alternative.

clarkhinchcliff
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Interesting. I ran your benchmark on Firefox and Chrome on my device, with opposite results. Firefox is thrice as fast with objects than maps. And Chrome is thrice as fast with Maps than objects

petrlaskevic
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Objects are faster in many ways, it all depends on the specific use case and whether you actually need this performance :)

aleksander