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

In the [previous](https://www.educative.io/courses/javascript-design-patterns-for-coding-interviews/what-are-design-patterns) lesson, you learned what design patterns are. Now, we’ll look at some popular design patterns in JavaScript. These include the following:

# Creational design patterns

These patterns are used to provide a mechanism for creating objects in a specific situation without revealing the creation method. The normal approach for creating an object might lead to complexities in the design of a project. These patterns allow flexibility in deciding which objects need to be created for a specific use case by providing control over the creation process.

Below is a chart that shows the patterns that fall under this category:


We will be practicing all of these creational patterns later in this course.

# Structural design patterns

 
These patterns concern *class/object composition* and relationships between objects. They let you add new functionalities to objects so that restructuring some parts of the system does not affect the rest. Hence, when some parts of structure change, the entire system does not need to change.

Let’s look at the patterns that fall under this category:



We will be practicing all of these structural patterns in this course as well.


# Behavioral design patterns

 
These patterns are concerned with communication between *dissimilar* objects in a system. They streamline the communication and make sure the information is synchronized between such objects.

Let’s look at the patterns that fall under this category:


We will be practicing some of these behavioral patterns in this course.

# Architectural design patterns

These patterns are used for solving architectural problems within a given context in software architecture.

Let's look at the patterns that fall under this category:

We will be practicing all of these architectural patterns in this course.

As discussed, design patterns play a major role in the structuring of an application and is of great use to a JavaScript developer. This course is designed to help you practice some of these patterns so you can confidently answer any questions related to them in an interview and be able to implement them at your job.


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In the next chapter, you’ll learn more about  creational design patterns and practice with some challenges and quizzes.

This lesson takes a look at the types of design patterns such as creational, structural, behavioral, and architectural design patterns.

Before We Begin

Introduction To Design Patterns

Creational Patterns

Structural Patterns

Behavioral Patterns

Architectural Patterns

Conclusion

Types of Design Patterns