7 JavaScript Design Patterns Every Developer Should Know

Design patterns in JavaScript are reusable solutions applied to commonly occurring problems in writing JavaScript web applications.

It is quite appropriate to refer JavaScript design patterns as templates to provide solutions to problems but not quite to say that these patterns can replace the developers.

Design patterns help combine experiences of many developers to structure the codes in an optimized manner that meet the problems we are seeking solutions to, and gives common vocabulary used to describe solutions to our problems than describing the syntax and semantics of our code.

JavaScript design patterns assist developers to write organized, beautiful and well-structured codes. Although design patterns, when used can easily be re-used, they can never supplement developers, rather they only support them by preventing minor issues that could lead to major problems on the web application development by providing generalized solutions that are not tied to a specific problem.

They decrease the overall codebase by doing away with unnecessary repetitions, thus makes our code more robust than the ad-hoc solutions.

In this article, I will explore seven best and most popular JavaScript design patterns, which of course most of them will fall under three categories namely; creation design patterns, structural design patterns, and behavioral design patterns. A pattern is something like the following image; just to acquaint you into the context.

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7 JavaScript Design Patterns Every Developer Should Know

A template for every project? Sounds amazing, isn’t it?

That’s also a level of coding I’m striving for.

One of the ways to achieve it is using design patterns, which help to write well-structured, beautiful, and organized codes.

In this story, we will discover some of the common design patterns used in JavaScript. Let’s get into it.

1. Constructor Pattern

You are familiar with constructors as functions that initialize objects with specific properties and methods.

The constructor pattern is similar to that definition. We use this pattern to create multiple instances of the same object.

There are many ways to create a new object in JavaScript. Take a look at the examples below:

// Using {} to create empty objects:
let person = {};

// Using Object() to create empty objects:
let person = new Object();
// Using function constructor:
function Person(name, age) {
  this.name = name;
  this.age = age;
  this.showName = () => console.log(this.name);
}
let person = new Person(‘Amy’, 28);
person.showName();

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JavaScript — Build your object a builder!

Design Patterns

Before we will go over the builder design pattern, let’s briefly go over design patterns in general.

What is a Design Pattern?

A design pattern is a general and reusable solution for common problems you may encounter when designing your software. Each design pattern solves a different problem and can be customized to your use case with much ease.

Why do we need them?

One of the main reasons we need design patterns is to make our software very changeable, so it will be maintainable and will support future changes.

All software programs have to change and modify or they will cease to exist. The amount of time we spend on maintaining a software program is bigger than the amount of time it takes us to develop the program.

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