Add timestamp information to the JavaScript console

console_patch.js

/**
   * Patch the console methods in order to provide timestamp information
   *
   * Usage:
   *  > console.log('ok')
   *  2012-09-06T11:52:56.769Z ok true
   *
   * Note:
   *  The patch will only be applied with the first call.
   *
   * Tested with V8 (Google Chrome & NodeJS)
   */
(function(o){
  if(o.__ts__){return;}
  var slice = Array.prototype.slice;
  ['log', 'debug', 'info', 'warn', 'error'].forEach(function(f){
    var _= o[f];
    o[f] = function(){
      var args = slice.call(arguments);
      args.unshift(new Date().toISOString());
      return _.apply(o, args);
    };
  });
  o.__ts__ = true;
})(console);

Brilliant! And I was going to say to put it in npm.

FYI, I had an issue with tests failing intermittently, was async timing issue, so step-through debugger really won't help, lots of console.log() in lots of places, but hard to see where the timing issue was. This just clarified everything.

This is very helpful, thanks!