In a function declaration, we can use &self, self and &mul. When is self used?

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Question:In a function declaration, we can use &self, self and &mul. When is self used?

1.Value consumed by function

2.Read only reference to value needed

3.Value mutated by function

4.Refer to local variable

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  1. In a function declaration, we can use &self, self and &mul. When is self used?
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