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 to complete the implementation of the code after studying the partial code.

The task here is to implement the builder pattern to create an assignment. Each assignment is of a *subject*: it has a level, which means it is either easy, medium, or hard. It also has a *due date*. The `announcement` function given to you displays all this information. You have to figure out where to put this function’s definition and how to build the assignment step-by-step.

## Input

The provided partial code

## Output

Complete implementation of the code and the result after calling the `announcement` method 

## Sample input

```
mathAssignment.announcement(); 
```

## Sample output
```
"Your Math assignment is: Hard. It is due on 12th June, 2020."
```

# Problem statement

In this challenge, you have to complete the implementation of the code after studying the partial code.

The task here is to implement the builder pattern to create an assignment. Each assignment is of a *subject*: it has a level, which means it is either easy, medium, or hard. It also has a *due date*. The `announcement` function given to you displays all this information. You have to figure out where to put this function’s definition and how to build the assignment step-by-step.

# Input

The provided partial code

# Output

Complete implementation of the code and the result after calling the `announcement` method 

# Sample input

```
mathAssignment.announcement(); 
```

# Sample output
```
"Your Math assignment is: Hard. It is due on 12th June, 2020."
```

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

Before We Begin

Introduction To Design Patterns

Creational Patterns

Structural Patterns

Behavioral Patterns

Architectural Patterns

Conclusion

Challenge: Builder Pattern

Problem statement

Input

Output

Sample input

Sample output