The ultimate guide to coding interviews: Learn and practice JavaScript design patterns tested by FAANG engineers. Get interview-ready in just a few hours with battle-tested solutions.

If you're an experienced developer, chances are your interviewer won't ask you about language syntax. Instead, they'll focus on things that test your understanding of software architecture, and how capable you are at finding optimized solutions to given problems. 

That’s where a strong understanding of design patterns comes in handy. It's often useful to be able to draw on established patterns instead of reinventing the wheel.

In this course, you will learn how to effectively deploy design patterns to answer interview questions. The course is divided into four sections: Creational Patterns, Structural Patterns, Behavioral Patterns, and Architectural Patterns. Each section has its own set of design patterns which you’ll learn to use through various challenges. 

Every challenge contains a detailed solution explanation. By the end of this course (and with some practice), you will be able to confidently use design patterns to tackle advanced coding interview questions in JavaScript.

JavaScript Design Patterns for Coding Interviews

# What is the adapter pattern?

The **adapter pattern** allows classes that have different interfaces (properties/methods of an object) to work together. It translates the interface for a class to make it compatible with another class.


This pattern is useful if an API is modified or new implementations are added to it. In this case, if the other parts of a system are still using the old API, the adapter pattern will translate the interface so that the two can work together. 

As you can see from the diagram above, the **client** cannot connect to the **adaptee** directly as the two interfaces are incompatible. This is where the **adapter** comes in. It translates the client's calls to its interface and redirects them into calls to the adaptee (original interface). 

Let's take a look at a coding example to understand this better.

# Example

In this lesson, you will learn about the adapter pattern in detail with the help of a coding example in this lesson.

Before We Begin

Introduction To Design Patterns

Creational Patterns

Structural Patterns

Behavioral Patterns

Architectural Patterns

Conclusion

Adapter Pattern

What is the adapter pattern?