The _____ Pattern is a design pattern for defining and evaluating expressions or commands in a custom language.
It involves abstract expressions, terminal and non-terminal expressions, and a context for evaluation.
* Visitor
* Null object
* Interpreter
* Memento
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Answer: Interpreter
The Interpreter Pattern is a behavioral design pattern in software development that is used to define a language grammar or syntax and provide a way to evaluate expressions written in that language.
It's typically used for tasks like interpreting and processing textual commands or expressions.
Key components of the Interpreter Pattern:
1) Abstract Expression:
The Abstract Expression is an abstract class or interface that defines the common interface for all terminal and non-terminal expressions in the language.
It typically includes an interpret() method.
2) Terminal Expression:
Terminal expressions represent the smallest units of the language and usually implement the interpret() method.
They do not have sub-expressions.
3) Non-terminal Expression:
Non-terminal expressions represent higher-level constructs that consist of multiple sub-expressions.
They also implement the interpret() method and can recursively evaluate their sub-expressions.
Context:
The Context contains information and state that is shared among expressions during evaluation.
t provides the necessary context for interpreting expressions.
Client:
The Client is responsible for constructing and assembling expressions based on the language's grammar and providing input to be evaluated.
The Interpreter Pattern is well-suited for scenarios where you need to process and evaluate expressions or commands specified in a custom language.
It enables the creation of interpreters that can handle complex expressions by breaking them down into simpler parts and recursively evaluating them.