Skip to content

Tracks Drills Topics Technologies Tech stacks Skill areas

Tracks Drills Topics

Loading

Aporeon

Technical interview practice, from one developer to another.

About Privacy Terms

Drills

Pick a focused question that fits your time, stack, and interview goal.

How much time do you have?

Show one-drill sessions you can finish now.

Search

Track

Practice style

Level

More filters1

Topic

Technology

Tech stack

Skill area

15 results across 1 active filter

Page 1 of 1

Concept questionEasy~5 min

Abstraction versus encapsulation in C#

Separates hiding implementation complexity from controlling access to state, with practical examples where both ideas work together.

Concept questionEasy~5 min

Access modifiers and assembly boundaries in C#

Uses public, internal, protected, private, and protected internal deliberately to control API surface and inheritance exposure.

.NETC#

Practice drill

Concept questionMedium~7 min

Choose an interface or abstract base class in C#

Chooses contracts and shared implementation based on substitutability, state ownership, evolution, and inheritance constraints.

Comparison questionMedium~7 min

Choose between records, classes, and record structs

Chooses a type shape from identity, value semantics, mutation, copy cost, default values, and serialization boundaries.

Concept questionMedium~7 min

Choose constructors, static factories, and builders

Creates valid objects with clear intent while choosing construction patterns proportionally to optional data, validation, and lifecycle complexity.

Concept questionMedium~7 min

Composition over inheritance in practical C#

Combines focused collaborators for independent behavior while recognizing cases where a genuine stable hierarchy remains simpler.

Concept questionEasy~5 min

Encapsulation and protecting object invariants

Uses controlled state transitions and intention-revealing APIs to keep objects valid rather than treating encapsulation as private fields alone.

Concept questionMedium~7 min

Equality, GetHashCode, records, and dictionary keys

Connects equality semantics to hash-based collections and chooses identity or value equality deliberately.

Concept questionMedium~7 min

Immutable object design and controlled mutation

Chooses immutable values and controlled mutable entities based on identity, concurrency, invariants, allocation cost, and update semantics.

Concept questionMedium~7 min

Inheritance, is-a relationships, and substitutability

Uses inheritance only for stable behavioral subtyping and tests whether derived objects preserve the promises callers rely on.

Concept questionEasy~5 min

Model objects around responsibilities and invariants

Starts object-oriented design from cohesive state and behavior instead of creating classes for every noun in a requirement.

Debugging scenarioHard~12 min

Overload resolution, overriding, and method hiding

Separates compile-time overload selection from runtime virtual dispatch and diagnoses method hiding through a base reference.

Concept questionMedium~7 min

Runtime polymorphism with interfaces and virtual dispatch

Explains how callers use one contract while runtime dispatch selects implementation, then connects that mechanism to extensible behavior.

Concept questionEasy~5 min

Static members versus instance state in C#

Uses static members for type-wide stateless behavior and constants while avoiding hidden global mutable state and lifetime problems.

Architecture scenarioHard~12 min

Tell, don't ask and practical object collaboration

Moves invariant-sensitive decisions toward the owning object while keeping orchestration, queries, and cross-boundary work appropriately explicit.