A quick runner for doing operations (either synchronous or asynchronous), in series

simpleSequence.js

// A quick runner for doing operations (either synchronous or asynchronous),
// in series
var simpleSequence = function (sequenceCallback) {
  // Collect the operations
  var operations = [];
  sequenceCallback(function (operation) {
    operations.push(operation);
  });
  // Do the operations
  (function perform() {
    var op = operations.shift();
    if (!op) { return; }
    if (op.length === 0) {
      op();
      perform();
    } else {
      op(function () {
        perform();
      });
    }
  })();
};

// How it works
simpleSequence(function (operation) {
  // Wait 200 ms
  operation(function (done) {
    setTimeout(function () {
      done();
    }, 200);
  });
  // Say hello
  operation(function () {
    console.log('hello');
  });
  // Wait again
  operation(function (done) {
    setTimeout(function () {
      done();
    }, 200);
  });
  // And then say goodbye
  operation(function () {
    console.log('goodbye');
  });
});