Best practice - Where to put my class constants

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I think most people would choose to use #1 or #2. #3 seems wrong since you are not declaring it as const but instead it looks like a normal class property. I would personally prefer #2. It saves you the effort to create the companion and also allows you to use the constant in utility functions or extensions you might define in the same file. That said #1 or #2 is down to personal preference and should be decided on by the team, but it doesn’t really matter.

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