I got graduated from the Cloud Developer nano-degree program ~ 2 weeks ago, and I decided to share my experience in quick Q&A, so if you have any other questions in your mind after reading this post, please don’t hesitate to comment. What’s Udacity Nano-degree? 💡 💡 It’s an online…

There are many ways to implement finding nearest locations by given latitude and longitude . Some of the implementations can be achieved through a backend logic, and the other ways can be done by utilizing some features(Spatial Indexes) provided by DBMSs’(Mysql, SQL, MongoDB,….etc). In this post I will explain by…

What is it ? — A query language for your API . — It is a methodology that directly competes with REST (Representational state transfer) APIs, much like REST competed with SOAP at first . — It’s not tied to a specific technology, but you can implement it in any language. -GraphQL is a…

Introduction: It’s a feature added in MongoDB starting from the version 3.6, that give you an ability to keep you up to date with your data changes . So in case of any changes(write messages: Insert, Update, Delete) that happen against a specific collection, it triggers a `change event` with the…

Yes!, we can execute DOM commands against documents or ( web pages ) using javascript. Actually, it started to happen when the HTML document has been switched to designMode . Document.designMode document.designMode controls whether the entire document is editable. Valid values are "on" and "off". According to the…developer.mozilla.org The entire document becomes editable, then the document object exposed new method called `execCommand`.

How the requests are being handled inside Node.js server ? First of all we need to know the main components inside any Node.js server : 1- Event Queue: It’s a queue that contains all the requests which are coming from the clients. for example: When the node.js server gets 1,2,3,4,…n…

…………………………Cross Origin Resource Sharing ……………………….. Let’s start with the following screenshot!

What’s Redux? Redux is an open-source JavaScript library for managing application state [Wikipedia] Actually, I will jump quickly, into an example so I can explain the Redux concept step by step in a better way . Let’s assume that we have a React JS application , and this application has…

What are the websocket’s headers that have to be configured ? First of all we have to know the two types of HTTP headers : 1- End to end headers : Which must be transmitted to the ultimate recipient of a request or response. 2- Hop by Hop headers …