Simple Javascript snippet performance test

gistfile1.js

// Simple Perf test on javascript snippets ( from http://coding.smashingmagazine.com/2012/11/05/writing-fast-memory-efficient-javascript/ )

var totalTime,
    start = new Date,
    iterations = 1000;
while (iterations--) {
  // Code snippet goes here
}
// totalTime → the number of milliseconds taken 
// to execute the code snippet 1000 times
totalTime = new Date - start;