Integrating Elm with Rails


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Front-end languages and frameworks are changing significantly over years. The trend is towards light-weight, modular architecture. Functional programming has influenced JavaScript and its frameworks a lot. For beautiful single page web applications, Elm is a framework that can be chosen. It gets compiled to efficient JavaScript code. But when to use Elm instead of JavaScript?  If you are building complicated single page applications Elm can do better.

Elm is a functional programming language created by Evan Czaplicki in 2012 for building reliable Web Applications. Elm is simple to use and offers much quality. Its architecture is a simple pattern for building web apps, that help you to add features quickly. Also, we can use Elm in existing projects as it can be used along with already written JavaScript code.

Why Elm?

Switching to functional programming languages makes it a better environment for multi-threaded applications. For example, immutability is a powerful functional concept that JavaScript lacks. But in Elm, once created value cannot be changed, thus making a thread-safe environment. Each thread need not worry about other threads when they act on data since these data are represented by immutable objects in Elm.

While in other languages it’s hard …

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Lazy enumerator to handle huge files


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Lazy evaluation, or call-by-need is an evaluation strategy which delays the evaluation of an expression until its value is needed. It’s frequently seen in functional languages, ruby introduced the lazy method in Ruby 2.0. For those who don’t know what are enumerators: enumerators are something that can be counted. So a collection of elements, files (file is an collection of lines of string), etc can be treated as an enumerator.

In ruby we need to make something countable into an enumerator object, which is done by applying .each and .map on it.

Ruby has a wide range of operations we can do over a collection, it’s one of those features that makes Ruby such a powerful dynamic language. An enumerator can be used to generate series like the Fibonacci series.

But when we do a .map / .each with a code block, then it would try to realize the enumerator fully and then apply the block over it.

That would be fine when we are working on something small like:

But when we take the above fib enumerator, which will grow into an infinite series, adding a .map would lead the code to an infinite loop. If you are crazy enough to write an infinite loop, …

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