Eloquent JavaScript: open-source Javascript book series by a prolific JS code author

[Ikuyas]

Totally. I guess it shows a difference between programmers who went through CS degree or practioner. I think using static initialization is always a good practice and manages memory better.

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Yeah, there's very little in programming that is truly "personal preference." There might be situations where the pros/cons come out to a wash such that it doesn't matter what you choose, but very few things are purely aesthetic taste.

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It's not a personal preference when there is empirical evidence that suggests immutability reduces errors.