Sometimes we may want to access indirectly to an object, via a substitute. That substitute is called Proxy. The Proxy Pattern helps us deal with a proxy object and talk to the actual object. In this tutorial, we’re gonna look at 2 ways to implement Proxy Pattern in Node.js:
- Using custom Proxy Class
- Using Proxy API
[Continue reading…] “Ways to implement Proxy Pattern in Node.js”
Dependency Injection is one form of Inversion of Control technique that supports the Dependency Inversion principle (the last one of SOLID Principles – decoupling software modules). In this tutorial, we’re gonna look at way to implement Dependency Injection pattern in Node.js.
[Continue reading…] “How to implement Dependency Injection in Node.js with Example”
When we want to create complicated object which has multiple parts, we can use Builder Pattern that separates the building of these parts. This creational process does not care about how these parts are assembled.
In this tutorial, we’re gonna look at 2 ways to implement Builder Pattern in Node.js:
- using Builder function
- using Builder class
[Continue reading…] “How to implement Builder Pattern in Node.js”
Instead of using class constructors or
new keyword to create an object of a class, we can abstract this process. So, we can determine the type of object at run-time, by the time of generating that class object. The implementation seems like Factory Method, but simpler than Factory Method. This simple Factory is not treated as a standard GoF design pattern, but the approach is common to any place where we want to separate the code that varies a lot from the code that does not vary.
In this tutorial, grokonez shows you how to do it in NodeJs.
[Continue reading…] “How to implement simple Factory Pattern in Node.js”
Singleton is object that can have only a single, unique instance, with a single point of access. Node.js module system provides simple way to implement Singleton using
module.exports. Module will be cached when it is accessed using
require() statement. So our module is merely a cached instance although it behaves like a Singleton.
In this tutorial, we’re gonna look at ways to implement this kind of Singleton in Node.js:
- Singleton Object
- Singleton Class
[Continue reading…] “How to implement Singleton in Node.js”
In the tutorial, Grokonez shows how to extract data from MySQL to CSV File with Node.js using [Continue reading…] “Node.js Extract MySQL Data to CSV File – using Json2Csv”
In the tutorial, Grokonez shows how to import data from Excel File to MySQL with Node.js using [Continue reading…] “Node.js Import Excel File to MySQL – using Read-Excel-File lib”
In previous post, we have a single Blockchain and the only way to access it is through API from a single server. It is centralized and not good because this API totally controls the whole Blockchain with all data inside it. Today we will build a decentralized Blockchain network that has many different instances of the API. So instead of just having our Blockchain hosted on a single centralized node, it is hosted across a decentralized network which will be very powerful because of the security: we don’t have to trust only one single entity.