MarcoWorms

const { head } = require('ramda')
const drawFromTop = draw(head)
const { card, newDeck } = drawFromTop(deck)

MarcoWorms

const draw = curry((cardPicker, deck) => {
  const card = cardPicker(deck)
  const newDeck = without(card, deck)
  return { card, newDeck }
})

MarcoWorms

const randomElement = array =>
  array[Math.floor(Math.random() * array.length)]

draw(randomElement, deck)

MarcoWorms

const last = array => array[array.length - 1]
const { card, newDeck } = draw(last, deck)

MarcoWorms

const head = array => array[0]
const { card, newDeck } = draw(head, deck)

MarcoWorms

const draw = (cardPicker, deck) => {
  // 1. We want to know what card we drew
  const card = cardPicker(deck)
  // 2. We want the new deck without the drawn card
  const newDeck = without(card, deck)
  return { card, newDeck }
}

MarcoWorms

const without = (element, array) => array.filter(e => e !== element)
// Watch out because on this one the "element" is not an array like the Ramda function.

MarcoWorms

const { without } = require('ramda')

const card = deck[0] // 1. Card
const newDeck = without([card], deck) // 2. Remaining deck

MarcoWorms

const deck = [
  { name: 'Fireball', damage: 6, cost: 2 },
  { name: 'Thunderstorm', damage: 10, cost: 3 },
  { name: 'Ice Razors', damage: 30, cost: 7 },
]

MarcoWorms

const thisIsADeck = [
  'this is a card',
  3464562456, // this is also a card,
  { attack: `i'm a property of a card!` }, // another card
  [
   `I'm an element inside a card.`,
   `I'm not a card because I'm not in the root level`,
   `The card in this case is the whole array containing these phrases`,
  ],
]