[Behavioral 3] Interpreter design pattern in simple words with TypeScript example

A quick look for the Interpreter design pattern in less than 5 minutes can help you get this pattern's basic idea. As always the code is attached and very much recommended to try it in action by yourself to better remember.

The Interpreter design pattern is a behavioral design pattern that is used to define a representation of a language’s grammar and provide an interpreter to deal with sentences in that language. The pattern can be particularly useful when you need to evaluate expressions that can be represented as trees or when you need to process structured text data.

Too complex, alright:
Imagine you have a calculator. It can understand and perform calculations based on mathematical expressions like "2 + 3".

The interpreter pattern is like the calculator's brain. It takes a mathematical expression (like "2 + 3") and breaks it down into smaller parts (numbers and operators). Then, it figures out how to combine these parts to get the final result (5).

In simpler terms, the interpreter pattern is a way to teach a computer how to understand and follow a set of rules (like grammar) to solve problems. It's like having a translator that can convert a foreign language (the expression) into a language the computer can understand (the result).