/**
 * Given an array of promise creators, executes them in a sequence.
 *
 * If any of the promises in the chain fails, all subsequent promises
 * will be skipped
 *
 * Returns the value last promise from a sequence resolved
 */
module.exports = function promiseWaterfall(tasks) {
  return tasks.reduce(
    (prevTaskPromise, task) => prevTaskPromise.then(task),
    Promise.resolve()
  );
};