Q1. What is the difference between a primary key and a foreign key?
A primary key uniquely identifies each row in a table. It must be unique and not null, and a table has at most one. It may be a single column or a composite of several, a...
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Q2. Explain generics and give a realistic use case.
Generics let you write code that works over many types while preserving the relationship between input and output types. ```ts function first(items: T[]): T | undefined {...
Q3. What do constructors and destructors do?
A constructor runs when an object is created and initialises its members. A destructor runs when it is destroyed and releases resources. Constructors share the class name...
Q4. How do generics and constraints work in C#?
Generics let you write type-safe, reusable code without boxing or casts. The type parameter is resolved at compile time, and the JIT specialises for value types while sha...
Q5. What is const correctness and why does it matter?
`const` is a compile-time contract. A `const` object cannot be modified, and a `const` member function promises not to modify the object, so it can be called on const obj...