Design patterns and refactorings in JavaScript

https://www.valentinog.com/blog/patterns/

Notes on software design patterns and refactorings applied to JavaScript.

#javascript #design-pattern

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Builder Design Pattern

What is Builder Design Pattern ? Why we should care about it ?

Starting from **Creational Design Pattern, **so wikipedia says “creational design pattern are design pattern that deals with object creation mechanism, trying to create objects in manner that is suitable to the situation”.

The basic form of object creations could result in design problems and result in complex design problems, so to overcome this problem Creational Design Pattern somehow allows you to create the object.

Builder is one of the** Creational Design Pattern**.

When to consider the Builder Design Pattern ?

Builder is useful when you need to do lot of things to build an Object. Let’s imagine DOM (Document Object Model), so if we need to create the DOM, We could have to do lot of things, appending plenty of nodes and attaching attributes to them. We could also imagine about the huge XML Object creation where we will have to do lot of work to create the Object. A Factory is used basically when we could create the entire object in one shot.

As **Joshua Bloch (**He led the Design of the many library Java Collections Framework and many more) – “Builder Pattern is good choice when designing the class whose constructor or static factories would have more than handful of parameters”

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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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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 Design Patterns

A pattern describes a Challange that happens over and another time in the environment, so describes the core of the answer thereto challenge, in such how that you simply will use this resolution a Tillion times over, without doing the same things twice.

In application development,it is important to focus on the strategy of constructing, associating application in a very healthy, very strong, and easily maintainable approach, patterns offer a way of giving names to solutions for common challenges. These solutions can vary from abstract to really precise and technical and allow developers to effectively communicate with each other.

The goal of this series is to whet your appetency for a somewhat formal discussion of knowledge in code development by introducing you to the thought of code vogue patterns and presenting a couple of patterns that ar fascinating as a result of they get used considerably in fashionable JavaScript comes.

Singleton pattern

The what

The singleton pattern isn’t one of the most widely used ones, but we’re starting here because it’s relatively easy to understand

The singleton pattern stems from the mathematical construct of a singleton that is:

In mathematics, a singleton, which is also known as a unit set, is a set with exactly one element. For example, the set {null} is a singleton.

The Singleton Pattern limits the number of instances of a particular object to just one. This single instance is called a singleton.

This simply means that we limit the actualization of a class to a single object. The primary time an object of a class implementing the singleton pattern should be incorporated, it is actually going to get incorporated. Any subsequent try is just going to return that first instance.

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Prototype Design Pattern - Java

Prototype design pattern tutorial

Definition of Prototype pattern

The prototype pattern is a creational design pattern in software development. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects.

Where to use the Prototype pattern

If the cost for creating a new object is expensive and costs resources.

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