Ferenc Almasi

Ferenc Almasi

1612343028

The Decorator Design Pattern in JavaScript

If you were working before with Angular or Mobx, you already somewhat familiar with decorators as they make heavy use of them. They have been part of other languages for long, but they are coming to JavaScript as well.

We can already use them today with polyfillers or compilers such Babel. If you are not familiar with decorators, we are talking about the following:

Experimental decorators

Here @observable is a decorator, which is responsible for wrapping the two properties with additional functionality. So how are they created? Let’s first take a step back and define what design patterns are in general.


The Decorator Design Pattern in JavaScript

#javascript #web-development #frontend #decorators #design-pattern #webtips

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The Decorator Design Pattern in JavaScript
Samanta  Moore

Samanta Moore

1623835440

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

#java #builder #builder pattern #creational design pattern #design pattern #factory pattern #java design pattern

Madyson  Reilly

Madyson Reilly

1602747125

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.

#javascript #javascript-tips #design-patterns #javascript-design-pattern #javascript-development

Ferenc Almasi

Ferenc Almasi

1612343028

The Decorator Design Pattern in JavaScript

If you were working before with Angular or Mobx, you already somewhat familiar with decorators as they make heavy use of them. They have been part of other languages for long, but they are coming to JavaScript as well.

We can already use them today with polyfillers or compilers such Babel. If you are not familiar with decorators, we are talking about the following:

Experimental decorators

Here @observable is a decorator, which is responsible for wrapping the two properties with additional functionality. So how are they created? Let’s first take a step back and define what design patterns are in general.


The Decorator Design Pattern in JavaScript

#javascript #web-development #frontend #decorators #design-pattern #webtips

Giles  Goodwin

Giles Goodwin

1603184040

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();

#javascript-development #design-patterns #javascript-tips #javascript #coding

Zena  Sporer

Zena Sporer

1596190560

Design Patterns — Decorator Design Pattern

Introduction

The decorator design pattern is a software design pattern that helps you add responsibilities to an object at runtime. This pattern is considered to be a structural design pattern. This type of pattern focuses on the relationships between classes and how they can help solve specific problems.

The Gang of Four, in their book Design Patterns: Elements of Reusable Object-Oriented Software, defined the intent of decorator pattern like this:

Intent:_ Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality._

One of the key characteristics of this design pattern is that it follows the Single Responsibility Principle (SRP). This is because each “decoration” you add to an object, will be encapsulated within a class. This class’s responsibility will be to handle everything related to adding that decoration to that object.


Time to assemble a 🍔

For purposes of learning the decorator pattern, let’s assume you want to create an object of type Hamburger.

How a hamburger is assembled varies. According to Burger King, there are 221,184 possible ways to order a Whopper. It will take you at least 200 years to eat these many hamburgers if you were to eat one hamburger for breakfast, lunch, and dinner! The possibilities are endless.

In a world without the decorator pattern, an approach you might take is to create a parent Hamburger class and then subclasses for the different types of hamburgers. This could easily become a maintenance headache as it will make troubleshooting more difficult due to the complexity of multiple levels of inheritance.

#design-patterns #java #software-engineering #decorator-pattern #programming