kutyel

const regex = /(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/u
const result = regex.exec('2018-07-05')

console.log(result[0]) // > '2018-07-05'
console.log(result[1]) // > '2018'
console.log(result[2]) // > '07'
console.log(result[3]) // > '05'

console.log(result.groups.year)  // > '2018'
console.log(result.groups.month) // > '07'

kutyel

fetch('http://example/endpoint')
  .then(data => data.json()) // todo bien, todo correcto...
  .catch(err => console.error(err)) // oh oh...
  .finally(() => console.log('...y yo que me alegro!')) // <-- lo nuevo 😎

kutyel

for await (const line of readLines(filePath)) {
  console.log(line)  
}

kutyel

const foo = { a: 1, b: 2, c: 3 }
const { x, ...y } = foo // rest properties

console.log(x) // 1
console.log(y) // { b: 2, c: 3 }

const bar = { d: 4, e: 5 }
const baz = { ...foo, ...bar } // spread properties
console.log(baz) // { a: 1, b: 2, c: 3, d: 4, e: 5 }

kutyel

Starting code:

const getRanges = compose(
  chain(([x, y]) => range(x, y + 1)),
  map(compose(map(Number), split('..'))),
  match(rangeRegex)
)
const getNumbers = compose(
  chain(identity),
  map(compose(map(Number), split(','))),

kutyel

function node_sos --description 'Node plz SAVE ME!!!'
  rm -rf node_modules package-lock.json; and npm install $argv;
end

kutyel

function clear_local_branches --description 'Removes all the local branches that have already been merged'
    command git fetch -p; and git branch -vv | awk '/: gone]/{print $1}' | xargs git branch -D
end

kutyel

const copySort = (array, order, key) =>
  [...array].sort(
    (a, b) => order.findIndex(x => x[key] === a[key]) - order.findIndex(x => x[key] === b[key])
  )
const order = [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4 }, { id: 5 }]
const unordered = [
  { id: 2, label: 'Two' },
  { id: 3, label: 'Three' },
  { id: 5, label: 'Five' },
  { id: 4, label: 'Four' },

kutyel

'use strict'

require('now-env')
const Twit = require('twit')
const Task = require('data.task')
const Maybe = require('data.maybe')
const bot = new Twit({
  consumer_key: process.env.CONSUMER_KEY,
  consumer_secret: process.env.CONSUMER_SECRET,
  access_token: process.env.ACCESS_TOKEN,

kutyel

Typical JS Interview Questions

What is a Closure?

Closure is when a function "remembers" its lexical scope even when the function is executed outside that lexical scope. (IMO: just a stupid function returning another partially applied function).

What is Hoisting?

Variable and function declarations are put into memory during the compile phase, but stays exactly where you typed it in your coding. There is no physically lifting to the top of the file at all.