Ruby: Closures and Arity

Photo by Fabian Grohs on Unsplash

In this post I’d like to discuss closures and arity in the Ruby language. First, some definitions. Closures are chunks of code that can be passed around and executed, meaning they are basically unnamed methods. In Ruby, the three types of closures are Procs, Blocks, and Lambdas. Arity refers to the rules about the number of arguments passed into Procs, Blocks, and Lambdas.

Even if you haven’t heard the term closure before, you’re probably already familiar with passing blocks into methods. For example:

Output:

1
2
3

In this piece of code, the block being passed into the #each method is

{ |num| puts num }

Blocks are commonly used with iterators to allow the user more flexibility when calling the method. But how are they implemented? One way is to use the yield keyword, which yields to the block, and then returns back to the function. For example:

Output:

1
2
3

This is a simple implementation of the #each method using the yield keyword. On line 3, yield calls whatever block was passed into the method, and will pass array[i] in as an argument. array[i] is accessible in the block via the block parameter num. Using the yield keyword allows us to write our own methods that use blocks. But what if we call yield when no block was passed in?

Output:

closures.rb:3:in `block in each’: no block given (yield) (LocalJumpError)

This raises the oddly named LocalJumpError, because the method tried to call the block but it wasn’t there. To create a method that works with or without a block, we can use the method #block_given?.

Output:

1
2
3

The #block_given? method returns true if a block was given, and false otherwise. So the updated #each method above will yield each array value to a block if one is given, and otherwise will just output each array value.

What we have been doing so far is using implicit block parameters. They are passed in after the other arguments, and the only way we can access them is with the yield keyword. However, there is a way to use an explicit block parameter.

Output:

1
2
3

Using ‘&’ gives us a variable that we can use to explicitly call the block that was passed in. Although it didn’t make a difference in this method, the benefit of doing this is that you can then pass the block to another method inside the original method because it can now be referenced with a variable. As a side note, the parameter prefaced with ‘&’ must always be the last parameter or an error will be raised. So how does it work? The following example gives a clue.

Output:

#<Proc:0x00007fcbab852568@closures.rb:11>
#<Proc:0x00007fcbab852568@closures.rb:11>
#<Proc:0x00007fcbab852568@closures.rb:11>

As you can see, it output the same Proc object 3 times. But why is it a proc when we passed in a block? The answer is that prefacing a method parameter with ‘&’ calls #to_proc on the argument passed in. So what is the difference between a proc and a block? The main difference is that a proc is an object and a block is not. This means the proc can be saved to a variable and passed around, and has access to all methods defined for the Proc class. Here’s how we could use a proc with the updated #each method.

Output:

1
2
3

Notice that we do not need to use ‘&’ here because the object is already a proc. But what if we need to pass a proc into a method that yields to a block?

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7 Reasons to Trust Ruby on Rails

Ruby on Rails is an amazing web development framework. Known for its adaptability, it powers 3,903,258 sites internationally. Ruby on Rails development speeds up the interaction within web applications. It is productive to such an extent that a Ruby on Rails developer can develop an application 25% to 40% quicker when contrasted with different frameworks. 

Around 2.1% (21,034) of the best 1 million sites utilize Ruby on Rails. The framework is perfect for creating web applications in every industry. Regardless of whether it's medical services or vehicles, Rails carries a higher degree of dynamism to each application. 

Be that as it may, what makes the framework so mainstream? Some say that it is affordable, some say it is on the grounds that the Ruby on Rails improvement environment is simple and basic. There are numerous reasons that make it ideal for creating dynamic applications.

Read more: Best Ruby on Rails projects Examples

7 reasons Ruby on Rails is preferred

There are a few other well-known backend services for web applications like Django, Flask, Laravel, and that's only the tip of the iceberg. So for what reason should organizations pick Ruby on Rails application development? We believe the accompanying reasons will feature why different organizations trust the framework -

Quick prototyping 

Rails works on building MVPs in a couple of months. Organizations incline toward Ruby on Rails quick application development as it offers them more opportunity to showcase the elements. Regular development groups accomplish 25% to 40% higher efficiency when working with Rails. Joined with agile, Ruby on Rails empowers timely delivery.

Basic and simple 

Ruby on Rails is easy to arrange and work with. It is not difficult to learn also. Both of these things are conceivable as a result of Ruby. The programming language has one of the most straightforward sentence structures, which is like the English language. Ruby is a universally useful programming language, working on things for web applications. 

Cost-effective 

Probably the greatest advantage of Rails is that it is very reasonable. The system is open-source, which implies there is no licensing charge included. Aside from that, engineers are additionally effectively accessible, that too at a lower cost. There are a large number of Ruby on Rails engineers for hire at an average compensation of $107,381 each year. 

Startup-friendly

Ruby on Rails is regularly known as "the startup technology." It offers adaptable, fast, and dynamic web improvement to new companies. Most arising organizations and new businesses lean toward this as a direct result of its quick application improvement capacities. It prompts quicker MVP development, which permits new companies to rapidly search for venture investment. 

Adaptable framework 

Ruby on Rails is profoundly adaptable and versatile. In any event, when engineers miss adding any functions, they can utilize different modules to add highlights into the application. Aside from that, they can likewise reclassify components by eliminating or adding them during the development environment. Indeed, even individual projects can be extended and changed. 

Convention over configuration

Regardless of whether it's Ruby on Rails enterprise application development or ecommerce-centered applications, the system utilizes convention over configuration. Developers don't have to go through hours attempting to set up the Ruby on Rails improvement environment. The standard conventions cover everything, improving on things for engineers on the task. The framework likewise utilizes the standard of "Don't Repeat Yourself" to guarantee there are no redundancies. 

Versatile applications 

At the point when organizations scale, applications regularly slack. However, this isn't the situation with Ruby on Rails web application development. The system powers sites with high traffic, It can deal with a huge load of worker demands immediately. Adaptability empowers new businesses to keep utilizing the structure even after they prepare their first model for dispatch. 

Checkout Pros and Cons of Ruby on Rails for Web Development

Bottom Line 

Ruby on Rails is as yet a significant framework utilized by organizations all over the world - of every kind. In this day and age, it is probably the best framework to digitize endeavors through powerful web applications.

A software development company provides comprehensive Ruby on Rails development to guarantee startups and MNCs can benefit as much as possible from their digital application needs. 

Reach us today for a FREE CONSULTATION. 

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Why should we use Ruby on Rails for Software Development?

What is Rails, Ruby on Rails?

Rails is a server-side web application development framework written in the Ruby programming language. Its emergence in 2005 has influenced and impacted web application development to a vast range, including but not limited to seamless database tables, migrations, and scaffolding of views. In the simplest understanding, Rails is a highly productive and intuitive software developer. 

Websites and applications of any complexity can be achieved with Ruby on Rails. The software is designed to perceive the needs of ruby on rails developers and encourage them with the best way out. It is designed to allow developers to write lesser code while spiking productivity much more than any other framework or language. Ruby on Rails rapid application development offers everyday web development tasks easier and uniquely out-of-the-box, both with the same effectiveness.

The Ruby on Rails framework is based on two philosophies:

 

• Don’t Repeat Yourself (DRY): It is a software development principle that ensures that every piece or entity of knowledge must be assigned with a single and unambiguous representation within a development system.
  
  It not only reduces the need to write lengthy codes but also eliminates the repetitive writing of codes. As a result, it provides a much more manageable web app development with the least possible bugs.
  

 

• Convention over Configuration (CoC): It indicates the highly opinionated feature that the Ruby on Rails framework possesses. It offers ready-made solutions or the “best way out” for many tasks in a web application and defaults them to the convention without the need for external specification. The programmer using the software is required to specify only the unconventional aspects of the web application. 

Some of the commonly known websites built by the Ruby on Rails software developers are Instacart, Scribd, Shopify, Github, ConvertKit, Soundcloud, GoodReads, Airbnb. It finds its application in Sa-as Solutions, Social Networking Platforms, Dating websites, Stock Exchange Platforms, etc.  

Read more: Why Ruby on Rails is Perfect for eCommerce Web Development

Why use Ruby on Rails: The multifold benefits

• Community and its abundant resources 

• There is a large community that is dedicated to Ruby on Rails that keeps it up-to-date and indeed encourages its family of developers to continue using it. They make sure the benefits are soaring with every update they make. 

• The community is committed to developing several ready-to-use code packages, commonly known as gems, for its users. They discuss and announce new project launches, help each other with queries, and engage in framework discussions and betterment. While Ruby on Rails helps developers in rapid application development, it also connects and grows businesses together.

• Project Scalability

• To talk about scalability, we indicate the ability to grow and manage more and more user requests per minute (RPM). However, this depends on the architecture rather than the framework. The right architecture of Ruby on Rails web application development allows it to write bulky codes and programs as compared to early-stage difficulties with scalability. 

• It uses the Representational State Transfer (REST) architecture. This will enable Rails to create efficient web applications based on Rails 6, launched last year in 2020, which addresses most scalability issues. The portable components are agile and help in a better understanding of new requirements and needful adaptations for any business. The framework and architecture allow both vertical and horizontal scalability.
  

• Fast Application Development and Cost Effectiveness

• Ruby on Rails is lucid, logical, and has lean code requirements, thereby cutting down redundancy and improving the overall development speed. Lesser amount of code is proportional to lesser time investment with optimal results. The more time it takes for development, the more expensive it becomes for the end customers.

• Considering the ready-made code modules/packages (gems) available, Ruby on Rails development company will less time and money are spent creating and modifying Rails websites and applications. Another advantage that has made Ruby on Rails super attractive for startups is its use of Model-View-Controller (MVC) architecture. It has a component separation scheme that speeds up the web development process and fixes any errors that occur.  

• Data Protection

• Rails framework and the Ruby on Rails community put in a lot of efforts for data protection and security of its customer base. It is also one of the efficient frameworks for developing database-backed applications. 

• The developers at Ruby on Rails cover many aspects of cybersecurity, including encryptions of  passwords, credit card information, and users’ personal database. Special measures are taken to prevent the framework from SQL injections and XSS attacks. 

• Ruby on Rails Enterprise Application Development

• Ruby on Rails simplifies the daily operations and lowers the cost of enterprise app developments. The prominent features include data management, seamless updating of applications, easy and efficient code development, and high scalability, as discussed above. 

• Ruby on Rails enterprise application development is preferred by companies and is slightly cost-intensive. It can be easily integrated with third-party apps like Oracle Business, Oracle, Windows services, and others. Ruby enterprise app development allows the developers and programmers to solve the problems at the root level, given its transparency.

Ruby on Rails V/S Django

Checkout Blog on Django vs Ruby on Rails Comparison

Bottom Line

There are several reasons to prefer Ruby on Rails discussed above and extend further to early detection of errors, reduced time to market, and easy adaptation for API developments. It makes web programming much easier and simplifies website building of any complexity. Its flexibility and acceptance among new developers and programmers make it the perfect, one-stop choice for software application development company in 2021. 

Source: https://techsite.io/p/2121044

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"Rewrite your Software," says Creator of Ruby on Rails

David Heinemeier Hansson is the creator of Ruby on Rails, co-founder & CTO of Basecamp, best-selling author, Le Mans class-winning race car driver, family man, frequent podcast guest, and inspirational conference speaker.

Ruby on Rails was created by David in 2003. From the day Evrone was founded, in 2008, we’ve been using the Rails open-source web framework daily. It has helped us write truly beautiful code for our projects thousands of times.

In addition to creating one of the most useful tools in software development, David has accomplished many other impressive feats, from writing the books “It Doesn’t Have To Be Crazy At Work”, “REWORK” and “REMOTE: Office Not Required”, to racing in the FIA World Endurance Championship. In 2014, he came in first in his class in the 82nd running of The 24 Hours of Le Mans, the world’s most prestigious sports car endurance race. He also won the WEC championship in the GTE-Am category that year.

In 2020, we invited David to speak at RubyRussia, Evrone’s 11th annual Moscow programming conference. Prior to the event, we got a chance to talk to David about the world of software development and his approach to writing phenomenal code.

The Interview

Evrone: Hey David, it’s a pleasure to be speaking with you today. Let’s start our interview. What is the best way for an average developer to decide whether they need to start with a “low JavaScript” approach and evolve their application later or use Angular, React or Vue from the start? What decision strategy would you recommend?

David: If you’re building something that looks or tastes like a vanilla web app, like Basecamp, GitHub, Shopify, whatever, then I think minimal-JS is the way to go. It’s not no JS, just minimal. If you’re building something that’s highly interactive, like a game, or a photo editing app, or anything that’s more of the single-screen-tons-of-state variety, then looking into a full SPA makes sense.

**Evrone: **As codebase and team grow larger, what parts of the typical Rails application would you recommend to move into microservices? Given that a business wants a good code development organization, but rewriting the entire product from scratch is not an option.

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