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bob marley one love release date Interfaces are capable of describing the wide range of shapes that JavaScript objects can take.In addition to describing an object with properties, interfaces are also capable of describing function types.To describe a function type with an interface, we give the interface a call signature.This is like a function declaration with only the parameter list and return type given. So we might actually say if item, and we use that type assertion to say at this moment in time Im treating item as Song so I can successfully lookup that title property.