Why does TypeScript let you assign a RobotDog to a variable typed as Dog? Go!
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Why does TypeScript let you assign a RobotDog to a variable typed as Dog? Go!
In this Developer Challenge, a RobotDog can be assigned to a variable typed as Dog, even though RobotDog doesn’t extend Dog. At first glance, this feels like a type system bug. But TypeScript is working as intended! The twist? Add a private field to Dog and suddenly the assignment fails. Why does this happen, and what does it reveal about how ...
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