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Shorten validation code in Rails Application

In any application, there are chances that we keep repeating the same validation logic over the time. Specifically when those kind of validations are common type like email validation, required validation... or when it belong to business domain Rails can help you tackle this problem easily. It is bundled with

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Build dApp with Ethereum & React.js

Part 1 - Build smart contract with SolidityToday I'm going to show you how to build a blockchain application! Table of Contents 1. Installing Dependencies 2. Project Setup 3. List Tasks 4. Create Tasks 5. Complete Tasks Installing DependenciesGanache Personal BlockchainThe dependency is a personal blockchain, which is a local

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Big Query With Ruby On Rails

Today, I would like to introduce how to connect your Ruby on Rails app with Big Query of GCP. Before starting this tutorial, please make sure that you already have a GCP account. 0. First at all, where is Big Query in data life cycle ?GCP data cycleAs image above,

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Speed up Rspec tests with let_it_be

CI/CD plays a critical role in most of modern software development processes nowadays. By improving running speed of tests, you can help team to quickly detect issues, deliver faster, reduce pipeline's resources and so the cost. Typical rspec test Usually a typical rpsec test includes 2 part Prepare data:

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Build your first simple image classifier with JavaScript

In this article, I would like to present a simplest way to make your first application that could be used for image classification problem: detecting dog breed from an image. I. IntroductionLet's imagine that you have an application that received an image of dog and try to analyze which breed

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Set up and work with MySQL on Windows with XAMPP

I. What is XAMPP ?XAMPP is an open-sourced server setup to test the projects on a local machine before making it available to everyone over the web. This web app development server comes pre-installed with Apache web server, MySQL database, PHP, and Perl that help you build an offline application

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What is RegEx? Its usage, and how to use it?

1. DefinitionRegEx or Regular expression, according to Mozilla, is: Regular expressions are patterns used to match character combinations in strings.From me: To make it simpler for you to understand, it's like a string that defines other string(s); or if you still remember your math, it's kinda similar to

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TOP 5 reference websites for Japanese web design

01https://www.webdesignclip.com/ This is a website that allows users to consult web designs not only in Japan but also in the world, in addition, the site also synthesizes designs for landing pages and smart phones. 02https://bm.s5-style.com/ This website divides the design into many categories (service,

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Redis Pub/Sub and Redis Stream

Is Redis Stream better than Redis Pub/Sub for my chat service?That was a question for me when I first read about Redis Stream - a new data type introduced with Redis 5.0. So, I will go into a lot of details on them to get the answer.

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ActiveRecord performance: N+1 queries

Reference: https://guides.rubyonrails.org/active_record_querying.html#eager-loading-associations What is N+1 query? The N+1 query problem is one of the common performance antipatterns in ORMs. It happens when an application gets data from the database and then loop through the result of that data. Let's look

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Javascript: Spread Operator

What is Spread Operator? ES6 provided a new operator called spread operator that consists of three dots (...). The spread operator allows you to expand arguments for function calls, elements for array or key-value pairs for object. Example you have a function take 3 numbers as argument and calculate volume. Before

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Rails: "find_in_batches" vs."in_batches" in depth comparison

Rails, just like many other frameworks, has a lot of magic (and surprises too). Last month, when I had a chance to do a performance tuning for the ActiveRecord #find_in_batches and #find_batch I found some interesting thing about those two similar methods that's worth sharing. But first

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JavaScript: var, let and const

I. IntroductionECMAScript6 (abbr. ES6) is the second major revision to JavaScript and also known as ECMAScript2015. This is a JavaScript standard meant to ensure the interoperability of web pages across different web browsers. ECMAScript is commonly used for client-side scripting on the World Wide Web, and it is increasingly being

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Behavior-driven development

BDD represents behavior-driven development. BDD helps teams focus efforts on identifying, understanding and building features that delivery business values. BDD also suggests to documentation for features in up-to-date and executable manners. Focus on business valuesBDD pushes the team focus on delivery business values rather than doing tickets or tasks. From

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Accessibility for Software Developer

Your application is not accessibleIt was an ordinary day at my old company. My colleague (his name starts with J) and I were busy maintaining a mobile app project. Although only two developers are working on this project, we always try to do our best on the issues that we

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Top recommended UI-controls for front-end developer

1. Ant DesignHome page: https://ant.design/License: MITSuppported:ReactJS: https://ant.design/components/overview/Angular (2 or above): https://ng.ant.design/components/overview/enMobile viewport: https://mobile.ant.design/docs/react/introducePros: Good license to using.Pure engines with supported framework.Easy to edit and customize.Provide almost