Q1. 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 {...
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Q2. What are lifetimes in Rust and when do you need to annotate them?
Lifetimes are generic annotations that describe how long references remain valid, so the compiler can prove they never dangle. Most lifetimes are elided and invisible in ...
Q3. 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...
Q4. How do traits compare with interfaces in other languages?
A trait defines shared behaviour: a set of method signatures a type can implement. Implementations can be written for types you did not define, as long as you own the tra...
Q5. Explain declaration-site variance with in and out.
Variance describes how generic types relate when their type arguments are related. `out T` (covariant) means `Producer` can be used where `Producer` is expected. `in T` (...
Q6. Explain generics in TypeScript.
Generics in TypeScript enable you to create reusable code that can work with different data types. They act as placeholders for types and provide flexibility without sacr...