Adding console.log to every function automatically

Question

Is there a way to make any function output a console.log statement when it's called by registering a global hook somewhere (that is, without modifying the actual function itself) or via some other means?

Answer 1

Here's a way to augment all functions in the global namespace with the function of your choice:

function augment(withFn) {     var name, fn;     for (name in window) {         fn = window[name];         if (typeof fn === 'function') {             window[name] = (function(name, fn) {                 var args = arguments;                 return function() {                     withFn.apply(this, args);                     return fn.apply(this, arguments);                  }             })(name, fn);         }     } }  augment(function(name, fn) {     console.log("calling " + name); }); 

One down side is that no functions created after calling augment will have the additional behavior.