instagram-like-machine.js

const likeAll = () => {
  const likes = document.querySelectorAll('.glyphsSpriteHeart__outline__24__grey_9')
  console.log(`I'm going to like ${likes.length} posts`)
  likes.forEach(element => {
    element.click()
  })
}

var scroller = function(by) {
  window.scrollBy(0, by)
}

var startInterval = function(scrollBy, speed, endby) {
  var interval = setInterval(() => {
    this.scroller(scrollBy)
  }, speed*1000)

  setTimeout(() => {
    clearInterval(interval)
    likeAll()
  }, endby*1000)
}

startInterval(5000, 0.5, 30)