chain

chain.js

  $.chain = function() {

    var tasks
    , args = []
    , error = noop;
    if(arguments.length === 3) {
      args  = $.isArray(arguments[0]) ? arguments[0] : [arguments[0]];
      tasks = arguments[1];
      error = arguments[2];
    } else if(arguments.length === 2) {
      if ($.isArray(arguments[1])) {
        args  = $.isArray(arguments[0]) ? arguments[0] : [arguments[0]];
        tasks = arguments[1];
      } else {
        tasks = arguments[0];
        error = arguments[1];
      }
    } else if(arguments.length === 1) {
      args = []
      tasks = arguments[0];
      error = noop;
    } else 
      return false;

    var iterate, len
      , i = 0;

    tasks = $.map(tasks, function(task, key) { 
      return {key: key, task: task};
    });
    len = tasks.length;
    (iterate = function() {
      console.log("iterate", i, len);
      if (++i > len) return;
      var args = $.slice.call(arguments);
      try {
        tasks[i-1].task.apply(this, args.concat([iterate]));
      } catch(err) {
        error(err);
      }
    }).apply(this, args);
  };