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• Logging how long function took to run

var originalDoSomething = doSomething;
doSomething = function() {
  var startTime = new Date();
 // call the original version of the function
 var r = originalDoSomething.apply(this, arguments);
 var stopTime = new Date();
 console.log("Started at " + startTime + " and ended at " + stopTime);
return r
}