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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: 0s | source
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TheRoque ◴[31 Oct 25 14:07 UTC] No.45772138[source]▶
I also default to const in javascript. Somehow a "let" variable feels so dirty, but I don't really know why. I guess at this point my experience forged an instinct but I can't even put a theory on it. But it's sometimes necessary and I use it of course.
replies(2): >>45772627 #>>45773213 #
1. maleldil ◴[31 Oct 25 15:33 UTC] No.45773213[source]▶
JS's const doesn't go far enough since you can still mutate the object via its methods. In C++, you can only call const methods (which can't mutate the object) on const variables.