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 factory pattern?


The *factory pattern* is a creational pattern that provides a template that can be used to create objects. It is used in complex situations where the type of the object required varies and needs to be specified in each case.

It does not use the `new` keyword directly to instantiate objects. This means it does not explicitly require the use of a constructor to create objects. Instead, it provides a generic interface that delegates the object creation responsibility to the corresponding subclass.



# Example

As the name "factory" implies, we can use this pattern when we want to create different objects that have some similar characteristics. Let's look at an example to understand this better.

Consider the example from the [previous](https://www.educative.io/courses/javascript-design-patterns-for-coding-interviews/what-are-design-patterns) chapter where an ice cream factory can be used to create multiple flavors of ice cream. Let's see how we can apply the factory pattern in this example.

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


Before We Begin

Introduction To Design Patterns

Creational Patterns

Structural Patterns

Behavioral Patterns

Architectural Patterns

Conclusion

Factory Pattern

What is the factory pattern?