choo choo

train.js

const train = [
`        ooo
       
   o  ____
 _||__|  |  ______   ______   ______
(        | |      | |      | |      |
/-()---() ~ ()--() ~ ()--() ~ ()--()`,
`           
     oo
   o  ____
 _||__|  |  ______   ______   ______
(        | |      | |      | |      |
/-()---() ~ ()--() ~ ()--() ~ ()--()`,
`        ooo
     oo
      ____
 _||__|  |  ______   ______   ______
(        | |      | |      | |      |
/-()---() ~ ()--() ~ ()--() ~ ()--()`
].map(v=>v.split('\n'))


const longestFrame = longestIn(train)
let col = process.stdout.columns,
    x = col,
    t = 100

console.log('\033[2J') //clear the screen

;(async () => {
  while (x > -longestFrame) {
    for (let f of train) {
      for (let i = 0; i < f.length; i++) {
        process.stdout.cursorTo((x < 0) ? 0 : x, i)
        process.stdout.write(f[i].substring((x < 0) ? -x : 0, (x > col - longestFrame) ? col - x : undefined) + ' ')
      }
      x--
      await timeout(t)
    }
  }
})()


///////////
// stuff //
///////////

function longestIn(a) {
  let b = 0
  for (c of a) {
    for (d of c) {
      if (d.length > b) b = d.length
    }
  }
  return b
}

function timeout(ms) {return new Promise(a => setTimeout(a, ms))}