Daily Resource For Devs

Introduction This is an introductory article to help you understanding the tools and frameworks needed so that you can know from where and how to start creating your own Smart Contracts. In this post I will give you an overview of the tools, frameworks, libraries and languages used to create a Smart Contract in the Ethereum Blockchain . In the second part of this article, we are going to see how to create a Smart Contracts using Solidity and ee are also going to see how to run a Blockchain locally using Ganache , so that you can deploy, interact and test your Smart Contract in your local development environment. According to a definition from the Wikipedia website: A blockchain is a decentralized, distributed, and often public, digital ledger consisting of records called blocks that are used to record transactions across many computers so that any involved block cannot be altered retroactively, without the alteration of all subsequent blocks.. What do you need to know? T

Introduction In order to be able to search our logs based on a key/value pattern, we need to prepare our application to log and send information in a structured way to our log aggregation tool. In this article I am going to show you how to send structured log to ElasticSearch using Logstash as a data pipeline tool and how to visualize and filter log information using Kibana. According to a definition from the Wikipedia website: Elasticsearch is a search engine based on the Lucene library. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. According to Elasticsearch platform website , Elasticsearch is the heart of the Elastic stack, which centrally stores your data for lightning fast search. The use of Elasticsearch, Kibana, Beats and Logstash as a search platform is commonly known as the ELK stack. Next we are going to start up Elasticsearch, Kibana and Logstash using docker so we can better underst

Introduction I have been working in a project to enable anyone to fork and run a retrospective board in its own server. I have created 2 (two) projects: one for the UI with React and GraphQL using Apollo client and one for the GraphQL server also using Apollo (Server) and MongoDB for the database. In the following sections I am going to walk you through the steps and explain how to run both projects. Main features The board main features: - History of your past iteractions saved in the Mongo database - Easy url link format to quick access any past iteractions - Automatically add action items as last action items in the new board - Quick move items to Action Items Coming next You can fork the React UI from the following GitHub repo: - Support for multiple teams - Authentication - Subscriptions (pub/sub) Code Repo You can fork the React UI from the following GitHub repo: React Retrospective UI You can fork the GraphQL Server from the following GitHub rep

Introduction If you are trying to get a remote job in a top IT consulting company, you will definitely fall into a live code exercise where your algorithms, logical thinking and problem solving skills will be tested and you will have to demonstrate a solid knowledge of these concepts. Today I decided to write about a type of sorting algorithm that I found several times in interviews and decided, after studying the approach used, to create an initial solution in the simplest possible way. Understanding the logic As we know, the sort algorithm basically uses three basic principles to sort the items in a list. A comparator, a swap function, and recursion. For this selection sort algorithm I will focus in the first two. Given that we have the following list of numbers: 64, 25, 12, 22, 11, how would we use selection sort to swap and sort the list in an ascending order? The following code from the init function uses two for loops to create a temporary list (line 2) with the r

Introduction RabbitMQ is a centralized message broker based on the AMQP (Advanced Message Queuing Protocol) protocol, acting as a Middleware between Producers and Consumers of different systems. In a message system, Publishers sends a message to a message broker where messages are consumed some time later by one or more Subscribers. By introducing a message brokeer between systems we are decoupling the sender application from the receiver. In this case the service that is responsible for sending or publishing the message does not need to know about any other service. All it needs to care about is the message and its format. With a message system you send a message to a message broker first and when the consumers or listeners of it become online they can start consuming from the message queue. This means you can keep sending messages without even care if the other application is online or if they had any failures. RabbitMQ Architecture Exchange, queue and bindings are the

Introduction In our development environment, besides being easy and fast to use, above all, we need a lightweight version of it to run locally, right? I have tested different Oracle images and this was the option that best work for me. In this post i will show you how you can run the Oracle Database Express Edition version on your local machine quickly and easily and also how to connect to it using Oracle SQL Developer IDE and SQL*Plus. How to do it Basically we just need two simple steps to get our Oracle database running on our local environment. First we need to login to the Oracle Container Registry so we can pull the image from it and then we just need to run it in a container. You can find more information by going to the Oracle Container Registry , under the "Browse Containers", click into Database and next click in the express Repository for the Oracle Database Express Edition. I am going to skip the docker pull step, because docker run will do it for us