dependency-injection.js

var DI = function (dependency) {
  this.dependency = dependency;
};

DI.prototype.inject = function (func) {
  var $scope = func
    .toString()
    .match(/function *\((.*)\)/)[1]
    .split(',')
    .map(function (e) { return e.trim(); })
    .filter(function (e) { return /^[$\w]+$/.test(e); })
    .map(function (d) { return this.dependency[d]; }, this);

  return function () {
    return func.apply(null, $scope);
  };
};