- **Abstract Class**: Can contain implementation details for some methods alongside abstract method signatures. Abstract classes **emit runtime JavaScript class code**.
- **Interface**: Pure structural contract containing zero implementation code. Completely **removed during compilation**.

Q39: What is the difference between an `abstract class` and an `interface`?

Q40: What are Covariance, Contravariance, and Invariance in TypeScript?

Q38: What are Constructor Parameter Properties?

Comprehensive technical interview collection covering structural typing, generics, conditional types, template literals, utility types, and compiler internals.

75+ Essential TypeScript Interview Questions: Beginner to Metaprogramming Expert

Q39: What is the difference between an `abstract class` and an `interface`? - 75+ Essential TypeScript Interview Questions: Beginner to Metaprogramming Expert

Q39: What is the difference between an `abstract class` and an `interface`?

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