Crude benchmarking of node 0.5.x Array, Buffer, Uint8Array

yes_no_maybe01.js

// Time a certain set of operations using Array, Buffer, Uint8Array

var classes_to_try = 'Array Buffer Uint8Array'.split(' ');

// Note that the "pool size" for Buffer is currently defaulted to 8192,
// so sizes under this will be satisfied using the pool slice method,
// but any size over this will go direct to SlowBuffer allocations.

var buffer_sizes  = [100, 1000, 10000],
    buffer_allocs = 10,
    buffer_loops  = 1000;

if (process.argv.length < 3) {
  console.log('Usage: program loops_count reallocations_count sizes...');
}

if (process.argv.length >= 3  &&  process.argv[2]) {
  buffer_loops = parseInt(process.argv[2]);
}

if (process.argv.length >= 4  &&  process.argv[3]) {
  buffer_allocs = parseInt(process.argv[3]);
}

if (process.argv.length >= 5  &&  process.argv[4]) {
  buffer_sizes = [];
  for(var i = 4 ; i < process.argv.length; ++i) {
    buffer_sizes.push(parseInt(process.argv[i]));
  }
}

console.log('');
console.log('Loop repeats:  ', buffer_loops);
console.log('Reallocations: ', buffer_allocs);
console.log('Buffer sizes:  ', buffer_sizes);
console.log('');

for (var sizidx = 0; sizidx < buffer_sizes.length; ++sizidx) {
  var buffer_size = buffer_sizes[sizidx];

  for (var clsidx = 0; clsidx < classes_to_try.length ; ++clsidx) {
    var class_name = classes_to_try[clsidx];
    var class_ref = global[class_name];

    var trial_name = '  Class: ' + class_name + '      Size: ' + buffer_size;
    console.time(trial_name);

    for (var bfrcnt = 0; bfrcnt < buffer_allocs ; ++bfrcnt) {
      var buffer = new class_ref(buffer_size);

      var bfrlen = buffer.length;

      for (var loopcnt = 0; loopcnt < buffer_loops; ++loopcnt) {

        for (var bfridx = 0; bfridx < bfrlen ; ++bfridx) {
          buffer[bfridx] = bfridx;
        }

        for (var bfridx = 0; bfridx < bfrlen/2 ; ++bfridx) {
          var t = buffer[bfridx];
          buffer[bfridx] = buffer[bfrlen - bfridx - 1];
          buffer[bfrlen - bfridx - 1] = t;
        }
      }
    }

    console.timeEnd(trial_name);
  }

Forgot a } at the very end.