SOLID & Design Patterns Interview Question #58

What is the Interpreter Pattern?

Advanced Patterns, CQRS & Domain-Driven Design Fundamentals Mid-Level Intermediate

Quick Interview Answer

The Interpreter Pattern defines a representation for a simple language or grammar and provides objects that interpret expressions in that language. It can be used for small rule languages, expressions, or domain-specific syntax.

Detailed Explanation

For complex grammars, parser generators or dedicated parsing libraries are usually more appropriate. Interpreter can become difficult to maintain when grammar complexity grows substantially.

Code Example

public interface IExpression
{
    bool Interpret(Context context);
}

public class AndExpression : IExpression
{
    // Combines two expressions using AND logic.
}