Executes an array of promises in sequence. Useful when all promises access the same lock and could possibly time out if run in parallel (as in a database migration).

forEachPromise.js

var forEachPromise = function (array, callback) {
  var i = 0;

  function iterate() {
    if (i < array.length) {
      callback(arrray[i]).then(function () {
        i++;
        iterate();
      });
    }
  }
  
  iterate();
};