Returning self or void suggests mutability

So there’s a blog post that advises every method should, when possible, return self. I’d like to suggest you do the opposite: wherever possible, return something other than self. Mutation is hard Mutation makes code harder to reason about. Mutable objects make equality comparisons tricky: if you use a mutable object as the key in a hashmap, for instance, then change one of its fields, what happens? Can you access the value by the new string value? By the old one? What about a set? An array? For ...

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