Ruby lambdas. Lambda: standard # Creating a lambdal = lambda { |name| "Hi #{name}!
" } # Executing the lambdal.call("foo") # => Hi foo! Ruby lambdas. What is the meaning of "do. Change "origin" of your GIT repository. Sum of XOR of all pairs in an array. Sum of XOR of all pairs in an array Given an array of n integers, find the sum of xor of all pairs of numbers in the array.
Examples : The Ins and Outs of Debugging Ruby with Byebug - SitePoint. Ruby on Rails is, arguably, one of the finest innovations in modern web development.
Its astute focus on simplicity and developer productivity, combined with user satisfaction, precipitated a culture of rapid prototyping with a heavy focus on unit testing (even if DHH has since revised his position.) Rails has, no doubt, been a catalyst for many successful startups (Twitter among them). One of the main criticisms levelled at it (particularly from people who are less experienced in using it) is the heavy use of ‘magic’. As Ruby developers, we are acutely aware that magic is simply DSLs and metaprogramming, but that can still prove frustrating to debug. Podcast 314: How do digital nomads pay their taxes? Almost all software developers are being asked to work fully remote, and many companies are moving to keep this arrangement permanent.
This raises a lot of new questions around taxes, legal liabilities, and compensation. A nice story on how to avoid the Nomad Tax Trap. Got a lot of employees moving to Texas? The state is notorious for the number of patent lawsuits filed there, and having employees living in the area may expose companies to great legal liability. If the work from home boom is here to stay, get ready for a lot of “cost-of-living” adjustments to follow. Raise.dev — Take your career to the next level.
What's the difference between "git fetch" and "git pull"? Before we talk about the differences between these two commands, let's stress their similarities: both are used to download new data from a remote repository.
Downloading data is an essential step in your daily work - because the remote data you are looking at in your local repository is just a "snapshot". It's only as up-to-date as the last time you explicitly downloaded fresh data from the remote with "fetch" or "pull". It's vital to keep this fact in mind when inspecting remote branches and commits! Practical use of JSONB attributes in Ruby on Rails forms.
Practical use of JSONB attributes in Ruby on Rails forms Nov 3 2016 As you probably already know by now, Postgres 9.4 introduced JSONB as a new column type, effectively allowing you to use it both as a relational database and a full-fledged indexed and queryable document store when needed instead of trying to shoehorn everything into the latter and then dealing with the inevitable aftermath.
Himal B. - Computer Programming Online tutor - Classgap. Master Many-to-Many Associations with ActiveRecord - SitePoint. Using PostgreSQL and jsonb with Ruby on Rails - Nando Vieira. PostgreSQL 9.4 introduced jsonb, a new column type for storing documents in your relational database. jsonb and json columns look exactly the same on a higher level, but differs on the storage implementation.
The advantage of using jsonb is that you can easily integrate relational and non-relation data, with performance that can be better than most non-relational databases like MongoDB. Understanding the differences between json and jsonb So, what are the differences between both column types? When you compare writing speed, jsonb will be slightly slower, due to the way data is stored. json stores an exact copy of the text input, which must be reparsed again and again when you use any processing function. Another difference is that json columns will reparse the stored value every time; that means that key ordering will be same from the input. Let’s run a small benchmark. Inserting 30,000 records didn’t have any real difference, so I believe that jsonb can be slower in complex structures.
NestedAttributes. Ruby on Rails 6.1.2.1 Module ActiveRecord::NestedAttributes::ClassMethods activerecord/lib/active_record/nested_attributes.rb Active Record Nested Attributes Nested attributes allow you to save attributes on associated records through the parent.
By default nested attribute updating is turned off and you can enable it using the accepts_nested_attributes_for class method. The attribute writer is named after the association, which means that in the following example, two new methods are added to your model: Nested Models · heartcombo/simple_form Wiki. Nested Models let you build forms that update an object and its associated objects all in one shot.
Background To use nested models with simple_form, there are two rails features that you have to understand: accepts_nested_attributes_for - an ActiveRecord class method that goes in your model code - it lets you create and update child objects through the associated parent. An in depth explanation is available in the ActiveRecord documentation.fields_for - a helper method that goes in your view code - it builds form fields for your nested models.
Ruby on Rails Nested Attributes. Build method on ruby on rails. Complex Rails Forms with Nested Attributes - SitePoint. Learn more on ruby with our tutorial Understanding Eigenclasses in Ruby and Realizing Their Importance on SitePoint.
Rails provides a powerful mechanism for easily creating rich forms called “nested attributes.” It allows you to combine more than one model in your forms while keeping the same basic code pattern that you use with simple single model forms. In this article I’ll be showing a number of different ways to use this technique. Ruby on Rails - Creating and Using a Custom Method. Controller - Rails undefined method. Ruby - How to reverse a 'rails generate' SQLite vs MySQL vs PostgreSQL: A Comparison Of Relational Database Management Systems. Introduction The relational data model, which organizes data in tables of rows and columns, predominates in database management tools. Today there are other data models, including NoSQL and NewSQL, but relational database management systems (RDBMSs) remain dominant for storing and managing data worldwide.
This article compares and contrasts three of the most widely implemented open-source RDBMSs: SQLite, MySQL, and PostgreSQL. Specifically, it will explore the data types that each RDBMS uses, their advantages and disadvantages, and situations where they are best optimized. A Bit About Database Management Systems. Mario Peshev's answer to How should I ask for an internship? - Quora. Collections of Records in JavaScript. When you need to keep track of a simple list of numbers or strings, the Array object is your most direct tool.
Eloquent JavaScript. We think we are creating the system for our own purposes. We believe we are making it in our own image... But the computer is not really like us. It is a projection of a very slim part of ourselves: that portion devoted to logic, order, rule, and clarity. This is a book about instructing computers. Computers are about as common as screwdrivers today, but they are quite a bit more complex, and making them do what you want them to do isn’t always easy. Linkedin-skill-assessments-quizzes/javascript-quiz.md at master · Ebazhanov/linkedin-skill-assessments-quizzes. Top 72 Ruby on Rails Interview Questions And Answers. 37 Essential JavaScript Interview Questions and Answers. The above code will output the following to the console: "122" "32" "02" "112" "NaN2" NaN Here’s why… The fundamental issue here is that JavaScript (ECMAScript) is a loosely typed language and it performs automatic type conversion on values to accommodate the operation being performed.
10 Interview Questions Every JavaScript Developer Should Know. Good to hear: Classes: create tight coupling or hierarchies/taxonomies.Prototypes: mentions of concatenative inheritance, prototype delegation, functional inheritance, object composition. Red Flags: No preference for prototypal inheritance & composition over class inheritance. Learn More: 4. FullStack.Cafe - Kill Your Next Tech & Coding Interview.
Junior FrontEnd JavaScript Developer Interview Questions - Creative Tim's Bloh. General advice and conclusions Depending on the framework the company uses, you’ll most probably have lots of questions about it. Css - How to align a <div> to the middle (horizontally/width) of the page. Awesome Ruby. Ruby on Rails. By David Heinemeier Hansson in January, 2016. Rails Doctrine. Understanding JavaScript Constructors. The following is a guest post by Faraz Kelhini. Ruby classes vs. JavaScript constructors. 10 Essential Software Developers Interview Questions and Answers. Being able to communicate well is one of the most important skills a candidate can have.
A question like this will give you an idea of how the candidate handles the most difficult or complex conversations. Job developer. Programming Interview Questions + Help Getting Job Offers. Date() constructor. Barcelona - hub of MusicTech startups. The music industry is not an exception, it got influenced by technology as well. Innovators are developing MusicTech to find new ways music can be created and performed. And startups try to automate everything that can be automated, eliminating pain points for artists.
The digital era also gave a lot of opportunities for followers and admirers to interact with their favourite artists and music bands. Technology continues to change the music industry and the term MusicTech is widely used now. And today we will look at key startups and ideas that may revolutionize the industry. If we look back at the history, we would definitely pay attention to the iTunes creation in 2004, the rise of giants like Spotify and Soundcloud, which helped transform streaming culture into a digital global community. Global music innovation disrupted fields such as experiential music robotics, playlisting, artist rights, music distribution data management, etc.
Why Coding Bootcamp Grads Can’t Find Jobs (2020) by Rubén Harris, CEO of #CareerKarma. Regular expressions 1. Special characters. The following characters are the meta characters that give special meaning to the regular expression search syntax: \ the backslash escape character. The backslash gives special meaning to the character following it. For example, the combination "\n" stands for the newline, one of the control characters. CSS Button Generator. (1) TechmakerTV. Learn Ruby on Rails. (1) Fireship. (1) Programming with Mosh. The Net Ninja.
(1) Dev Ed. (1) Academind. JavaScript 30 — Build 30 things with vanilla JS in 30 days with 30 tutorials. Learn JavaScript.