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John Carmack on mutable variables

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498 points azhenley | 1 comments | 31 Oct 25 02:34 UTC | HN request time: 0.381s | source
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mcv ◴[31 Oct 25 13:31 UTC] No.45771788[source]▶
I use Javscript mostly. Or Typescript actually, these days. I remember when ES2015 introduced `let` because `var` had weird scoping issues. But ever since, I barely use either of them. Everything is `const` these days, as it should.
replies(3): >>45771959 #>>45772006 #>>45772055 #
1. LogicHound ◴[31 Oct 25 13:58 UTC] No.45772055[source]▶
`var` doesn't have weird scoping issues, it just different than other languages. `var` is function scoped, thus all var declarations are hoisted to the top of the function during execution.

This is why the single var pattern used to be recommended.