Design Patterns.

Software design patterns and principles. Covers 12 sub-skills.

• Design Patterns · 1 of 3

  SOLID Principles

  How many principles make up the SOLID acronym?

  AFourBThreeCSevenDFive

• Design Patterns · 2 of 3

  Structural Patterns (Adapter, Decorator, Proxy)

  Which structural pattern provides a simplified interface over a complex subsystem?

  AAdapterBProxyCBridgeDFacade

• Design Patterns · 3 of 3

  Event Sourcing & CQRS

  Reviewing an ES design, a senior engineer flags 'this isn't really event sourcing, it's just an audit log.' Per current framing, the missing capability that makes the difference is which of these?

  AEvents are emitted to a durable broker on every state mutationBAggregate state is rebuilt by replaying events, not stored directlyCAn async consumer mirrors mutations into a separate analytics storeDEach command writes one row to a chronologically ordered table