Add a line of code to ALL functions

Question

So I am working in JS a lot, and I am working a lot with events (try to stay as modular as possible). Current I am calling Event.fire(\'eventName\') at the end

Answer 1

You could create a function that builds functions which always have that functionality:

var eventFunctionFactory = function(fn, e) {
  if (typeof fn != 'function' || typeof e != 'function') {
    throw new TypeError('Invalid function!');
  }

  return function(/* arguments */) {
    // Convert arguments to array
    var args = Array.prototype.slice.call(arguments);

    // Fire event
    Event.fire(e);

    // Call the function with the applied arguments
    // Return its result
    return fn.apply(fn, args);
  };
};

var myClass = function() {
  this.someFunction = eventFunctionFactory(
                        // Function
                        function(a, b) {
                          return a + b;
                        },

                        // Event
                        function() {
                          console.log('someFunction fired!');
                        }
                      );
};

var myObj = new myClass();

// Outputs:
// someFunction fired!
// 3
console.log(myObj.someFunction(1, 2));