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A comment on JavaScript Array.push is 945x faster than Array.concat. Parent comment

Re:JavaScript Array.push is 945x faster than Array.concat by jamesfmilne on Thursday May 23, 2019 @12:38PM (#19993288)
concat() does not mutate the array, it creates a new one.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

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