We examine the data structure Task, see some constructors, familiar methods, and finally how it captures side effects through laziness. We are going to check two libarays, one is 'data.task'. another is 'crocks/Async': Install: npm i -S data.task npm…
We examine the data structure Task, see some constructors, familiar methods, and finally how it captures side effects through laziness. We using a 'data.task' library. It is a bit similar to $q library in Angular. Accepts one function, function takes…
In computer science, functional programming is a programming paradigm, a style of building the structure and elements of computer programs, that treats computation as the evaluation of mathematical functions and avoids state and mutable data. It is a…
1. Functional programming treats computation as the evaluation of mathematical and avoids state and mutable data. Scala encourages an expression-oriented programming(EOP) 1) In expression-oriented programming every statement is an expression. A state…
Lifting Now, let's review map from another perspective. map :: (T -> R) -> [T] -> [R] accepts 2 parameters, a function f :: T -> R and a list list :: [T]. [T] is a generic type paramterized by T, it's not the same as T, but definitely shares s…
Functions in Java Prior to the introduction of Lambda Expressions feature in version 8, Java had long been known as a purely object-oriented programming language. "Everything is an Object" is the philosophy deep in the language design. Objects a…
background In pursuit of a real-world application, let’s say we need an e-commerce web applicationfor a mail-order coffee bean company. They sell several types of coffee and in differentquantities, both of which affect the price. Imperative methods F…
A functional programming function is like a mathematical function, which produces an output that typically depends only on its arguments. Each time a functional programming function is called with the same arguments, the same result is achieved. Func…
In this blog post I will talk about the changes coming in Angular 2 that will improve its support for functional programming. Angular 2 is still in active development, so all the examples are WIP. Please focus on the capabilities and ideas, and not t…
It is really important to understand function signature in functional programming. The the code example below: const map = fn => anyFunctor => anyFunctor.map(fn); 'map' is pointfree version of any founctor's map, for example: Maybe.of('maybe').map(t…
In functional programming, a monad is a design pattern that defines how functions, actions, inputs, and outputs can be used together to build generic types,[1] with the following organization: Define a data type, and how values of that data type are…
We refactor a standard node callback style workflow into a composed task-based workflow. Original Code: const app = () => { fs.readFile('config.json', 'utf-8', (err, content) => { if (err) throw err; /g, '); fs.writeFile('config1.json', newContents,…
What is applicative functor: the ability to apply functors to each other. For example we have tow functors: Container(2), Container(3) // We can't do this because the numbers are bottled up. add(Container.of(), Container.of()); // NaN We cannot just…
Let's examine a pointfree way to write these applicative calls. Since we know map is equal to of/ap, we can write generic functions that will ap as many times as we specify: const liftA2 = curry((g, f1, f2) => f1.map(g).ap(f2)); const liftA3 = curry(…
Before we introduce what is Monad, first let's recap what is a pointed functor: A pointed functor is a Functor with .of() method Why pointed Functor is imporant? here OK, now, let's continue to see some code: const mmo = Maybe.of(Maybe.of('nunchucks'…
A pointed functor is a functor with an of method class IO { // The value we take for IO is always a function! static of (x) { return new IO(() => x) } constructor (fn) { this.$value = fn; } map (fn) { return new IO(compose(fn, this.$value)) } } What'…
We will see a peculiar example of a pure function. This function contained a side-effect, but we dubbed it pure by wrapping its action in another function. Here's another example of this: // getFromStorage :: String -> (_ -> String) const getFromSto…
When using ADTs in our code base, it can be difficult to use common debugging tools like watches and breakpoints. This is mainly due to the common pattern of using compositions and other ways of manipulating how functions are called. This can cause u…
Link:http://refactoring.info/tools/LambdaFicator/ Problem Description Java 8 will support lambda expressions and will extend the Collections APIs with functional operations like map or filter that apply a lambda expression over the elements of a coll…
Functor composition is a powerful concept that arises when we have one Functor nested in another Functor. It becomes even more powerful when both of those are Chains, allowing us to apply each Functor’s special properties and effects for a given comp…
