enoughtodo.js

/**
 * set goals to do
 * 
 * Usage:
 * 
 * var meet = enoughToDo('a', 'b', function(goals) {
 *   // Congratulations! All goals met
 *   // It's enough to do the final callback
 *   console.log(goals);
 * });
 * meet('a');
 * meet('b'); // all goals met
 * 
 * @param {String} goals
 * @param {Function} callback trigger while all goals met
 * @return {Function} meet function
 */
var enoughToDo = function(/*[goal, ..], cb*/) {
  var self = this,
    args = Array.prototype.slice.call(arguments, 0),
    callback = typeof args[args.length - 1] == 'function' ? args.pop() : function() {},
    goals = args,
    meets = [];

  return function() {
    meets = meets.concat(Array.prototype.slice.call(arguments, 0));
    
    // check goals met
    if (goals.length 
      == 
      goals.filter(function(v) {
        return meets.indexOf(v) > -1;
      }).length
    ) {
      callback(goals, meets);
    }
  };
};