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Or use a library that doesn’t modify the input…

• _a_a_a_ 3y ago
  By deep-copying it, right? Sometimes it is needed.
  • WendyTheWillow 3y ago
    …the whole thread you’re replying to is about it not actually being necessary. To participate in this conversation you either accept that premise or disagree with it, passing it as a given is not really an option for the argument.
  • jcparkyn 3y ago
    If you know what modifications you need to make (hopefully the library author does), you only need to clone the relevant parts of the object (e.g. with spreading). Deep cloning still isn't usually necessary unless you're doing wierd stuff.
    • qayxc 3y ago
      The Date object would like to have a chat with you ;)
      • jcparkyn 3y ago
        I know you were mostly joking, but for cloning dates you can "just" use the constructor (https://stackoverflow.com/a/69601256 https://stackoverflow.com/a/69601256).