This lesson teaches you how arguments passed to a curried function allow us to store data in closure to be reused in our programs and applications. Since each argument, except for the final one, returns a new function, we can easily create reusable f…

Let's say we want to write a most simple implementation 'avg' function: const avg = list => { let sum = 0; for(let i = 0; i < list.length; i++) { sum += list[i] } return sum / list.length } Basiclly, the 'avg' function doing two things: Calculate su…

Let's we have some prediction functions, for each prediction function has a corresponding tag: const {gt, lte, gte, lt} = require('ramda'); const {flip} = require('crocks'); ), flip(lte, )); )); ); // taggedPred :: (b, (a -> Boolean)) // taggedPreds…

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…

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…

柯里化相当于函数重构: 偏函数相当于函数适配. So, what is the difference between currying and partial application? As we stated before: Currying: Ability to decompose a function with arity N (where N is > 1) in a chain of calls to smaller functions with arity 1. Partial a…

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…

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…