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

## Problem statement

In this challenge, you have been given the `Dress` class.

First, you need to define the `dressPrice` function, which is used to set the `price` of a dress and return it. The prices of different `type` of dresses are as follows:

   * `maxi`: `1000`

   * `gown`: `2000`

   * `skirt`: `500`

Every dress has a unique `serialNumber` and there cannot be multiple dresses with the same `serialNumber`. However, in the code given below, there is no such restriction. It allows dresses with the same `serialNumber` to be created more than once:

# Problem statement

In this challenge, you have been given the `Dress` class.

First, you need to define the `dressPrice` function, which is used to set the `price` of a dress and return it. The prices of different `type` of dresses are as follows:

   * `maxi`: `1000`

   * `gown`: `2000`

   * `skirt`: `500`

Every dress has a unique `serialNumber` and there cannot be multiple dresses with the same `serialNumber`. However, in the code given below, there is no such restriction. It allows dresses with the same `serialNumber` to be created more than once:

In this challenge, you have to implement the flyweight pattern to solve the given problem.

Before We Begin

Introduction To Design Patterns

Creational Patterns

Structural Patterns

Behavioral Patterns

Architectural Patterns

Conclusion

Challenge: Flyweight Pattern

Problem statement