Terminal Expression (Number):?

Short answer: The Number class is a terminal expression in the interpreter pattern. It represents a number in the expression and directly returns its value when the Interpret method is called.

Example code

public class Number : IExpression
{
private readonly int _number;
public Number(int number) => _number = number;
public int Interpret() => _number;
}

Real-world example (ShopNest)

Use a GoF pattern in ShopNest only when it removes duplication or makes a change safer—explain the problem it solves in the interview.

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.