Mid From PDF GoF Patterns Gang of Four Patterns

Easily Extendable:?

Short answer: New operations (e.g., subtraction, multiplication, etc.) can be added easily by creating new non-terminal expression classes (e.g., Subtract, Multiply). This makes the pattern highly extendable.

Say this in the interview

  1. Define — one clear sentence (the short answer above).
  2. Example — relate it to a project like ShopNest or your real work.
  3. Trade-off — when you would not use it.
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