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 builder pattern? 

The **builder pattern** is a type of creational pattern that helps in building complex objects using simpler objects. It provides a flexible and step-by-step approach towards making these objects. It also keeps the representation and process of creation shielded.

Consider the example of a restaurant that has to build a meal for its customers. The building process has various stages:

* The customer comes in and places an orders for a meal to the cashier

* The cashier forwards the order to the crew member (*the builder*) who makes the order

* The builder assembles the meal consisting of the burger, fries, and soda of choice

* The cashier receives the final meal from the builder

* The customer receives the final order from the cashier



Every meal ordered by the customer regardless of the choices for the burger, fries, and soda will follow the same process. As you can see, a complex object is created following a step-by-step process. 

# Example

Let's look at a coding example that implements the builder pattern:

In this lesson, we will go over the builder pattern in detail with the aid of a coding example.


Before We Begin

Introduction To Design Patterns

Creational Patterns

Structural Patterns

Behavioral Patterns

Architectural Patterns

Conclusion

Builder Pattern

What is the builder pattern?