performance-tuning-$1.lzx

<canvas width="100%" height="150" debug="true">
    <script>
      var trials = 30;

      function measure (target, iterations, description, trials, empty) {
        // Default arguments
        switch (arguments.length) {
          case 0:
            Debug.debug("No measurement target");
            return;
          case 1:
            iterations = 500;
          case 2:
            description = null;
          case 3:
            trials = 10;
          case 4:
            empty = function () {
              for (var i = 0; i < iterations; ) i++;
            }
        }
        // Compute overhead
        var overhead = 0;
        var total = 0;
        for (var j = 0; j < trials; j++) {
          var start = (new Date).getTime();
          empty();
          var end = (new Date).getTime();
          overhead += end - start;
          // Measure target
          var start = (new Date).getTime();
          target();
          var end = (new Date).getTime();
          total += end - start;
        }
        var usPerOp = Math.round((total-overhead)*1000/(trials*iterations));
        // Report results
        if (description != null) {
        Debug.debug("%w: %d\xB5s", description, usPerOp);
        }
        return usPerOp;
      }

      // What we want to measure
      var iterations = 100;
      function stringConcatenation () {
        for (var i = 0; i < iterations; i++) {
          "foo" + "bar";
        }
      }

      // Measure it
      measure(stringConcatenation, iterations, "String concatenation");
    </script>
  </canvas>
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