wdiasvargas

/**
 * Created in 21/06/2017.
 * Author: William Dias Vargas
 * Github: @wdiasvargas
 */
'use strict';
import yCombFact from './y-combinator-factorial'
export default (number) => ((fn) => fn(fn, number))((f, n) => (n <= 1)? 1: n * f(f, (n - 1)))

console.info(yCombFact(5))

Woodsphreaker

const findOddEvenNumbers = (toNumber = 50) => [...Array.from({length: toNumber + 1}).keys()]
      .reduce((acc, cur) => {

        cur % 2 === 0 ? acc[0].push(cur) : acc[1].push(cur)

        return acc

}, [[], []])

const evenNubers = findOddEvenNumbers(100)[0]

XerxesNoble

/**
* @desc Basic linear value animation that can accept simple easing functions and provides update & complete callbacks
* @param  {Object} values - Object with numerical values. eg. { value1: 0, value2: 20, someKey: 55 }
* @param  {Number} duration - How long (in milliseconds) the animation will be
* @param  {Object} options - target values, update callback & complete callback
* @param  {Function} [options.onComplete=(values) => values] - Callback that fires once animation is complete
* @param  {Function} [options.onUpdate=(values) => values] - Callback that fires when animation frame updates
* @param  {Function} [options.ease=(t) => t] - easing method eg. https://gist.github.com/gre/1650294
* @example
*

Woodsphreaker

const myItens = {
    itens: []
}

const addItens = (obj, value) => obj.itens.push(value)
const deleteItem = (obj, toseek) => obj.itens.map(remove(obj, toseek))
const updateItem = (obj, toseek, value) => obj.itens.map(update(obj, toseek, value))
const remove = (obj, toseek) => (curr, index) => curr.nome === toseek ? obj.itens.splice(index, 1) : null
const update = (obj, toseek, value) => (curr, index) => curr.nome === toseek ? obj.itens.splice(index, 1, value) : null

Woodsphreaker

Recuperar todos os valores do objeto

Tive uma situação em que precisei recuperar todos os valores de um objeto, mas esse objeto tinha vários níveis.

O que fiz então foi, criar uma recursividade, verificando cada nó do objeto, se o nó fosse o tipo Object, como quase tudo no JS é, a função é novamente chamada entrando em um loop até que todos os nós fossem processados e seus valores armazenados.

O reduce permite um valor inicial, então usando o concat e o valor inicial como um array vazio

Woodsphreaker

const numbersGenerator = (numbers) => [].concat(...Array(numbers).keys());
const props = [
    (num) => num % 2 === 0,
    (num) => !props[0](num)
]
const result = (range, type) => numbersGenerator(range).filter(_a => props[type](_a))
console.log(result(20,0)); 
console.log(result(20,1)); 

// caso de uso

anabastos

const criaArrayPrimos = x =>
  criaArray(x)
    .slice(2)
    .filter(checaFatores)

const criaArray = tamanho => Array.from({ length: tamanho }, (el, index) => index)

const checaFatores = n =>
  criaArray(maiorDivisor(n))
  	.slice(2)

suissa

function asyncFunc(e) {
  return new Promise((resolve, reject) => {
    setTimeout(() => resolve(e), e * 1000);
  });
}

const arr = [1, 2, 3];
let final = [];

function workMyCollection(arr) {

lubien

const
  composeN = (...fs) => x =>
    fs.reduceRight((x, f) => f(x), x)
  
, map = f => xs =>
    xs.map(f)

, reduce = f => xs =>
    xs.reduce(f)
    

reborg

Rich Already Answered That!

A list of commonly asked questions, design decisions, reasons why Clojure is the way it is as they were answered directly by Rich (even when from many years ago, those answers are pretty much valid today!). Feel free to point friends and colleagues here next time they ask (again). Answers are pasted verbatim (I've made small adjustments for readibility, but never changed a sentence) from mailing lists, articles, chats.

How to use:

• The link in the table of content jumps at the copy of the answer on this page.
• The link on the answer itself points back at the original post.

Table of Content