Train Driver: Prevent not following the instructions

[SleeplessByte]

Blocks writing all the examples below:

export function fixListOfWagons(ids) {
  const firstTwo = ids.slice(0,2)
  const rest = ids.slice(2)
  return [...rest, ...firstTwo]
}

export function correctListOfWagons(ids, missingWagons) {
  const firstOne = ids.slice(0,1)
  const rest = ids.slice(1)
  return [...firstOne,...missingWagons,...rest]
}

export function correctListOfWagons(ids, missingWagons) {
  return [ids[0], ...missingWagons, ...ids.splice(1)];
}

• slice will not be a function on the list
• [0] will return undefined
• console.log(missingWagons) will print List of (1,2,3) in node (and later also in web)