StoneCypher · June 10, 2017 22:18
diff --git a/duh.html b/duh.html
 <!doctype html>
 <html>

  <head>
    <script type="text/javascript">

      function now() { return new Date().getTime(); }

      function for_n(n) {

        const tr      = document.createElement('tr'),
              with_p  = new Array(n),
              without = new Array();

        const first = now();
        for (var i=0; i<n; ++i) { with_p.push(n); }
        const second = now();
        for (var i=0; i<n; ++i) { without.push(n); }
        const third = now();

        const count = document.createElement('td');
              count.innerHTML = n;

        const wo_t  = second - first,
              w_t   = third - second;

        const wo_td = document.createElement('td');
              wo_td.innerHTML = wo_t;

        const w_td = document.createElement('td');
              w_td.innerHTML = w_t;

        tr.appendChild(count);
        tr.appendChild(w_td);
        tr.appendChild(wo_td);

        document.getElementById('tgt').appendChild(tr);

 //        [count, w_td. wo_td].map(td => tr.appendChild(td) );

      }

      window.onload = function() {
        [1e2, 1e3, 1e4, 1e5, 1e6, 1e7].map(n => for_n(n));
      }

    </script>
  </head>

  <body>
    <table>
      <thead><th>Count</th><th>With<br/>prealloc</th><th>Without<br/>prealloc</th></tr>
      <tbody id="tgt"></tbody>
    </table>
  </body>

 </html>
	<!doctype html>
	<html>

	<head>
	<script type="text/javascript">

	function now() { return new Date().getTime(); }

	function for_n(n) {

	const tr = document.createElement('tr'),
	with_p = new Array(n),
	without = new Array();

	const first = now();
	for (var i=0; i<n; ++i) { with_p.push(n); }
	const second = now();
	for (var i=0; i<n; ++i) { without.push(n); }
	const third = now();

	const count = document.createElement('td');
	count.innerHTML = n;

	const wo_t = second - first,
	w_t = third - second;

	const wo_td = document.createElement('td');
	wo_td.innerHTML = wo_t;

	const w_td = document.createElement('td');
	w_td.innerHTML = w_t;

	tr.appendChild(count);
	tr.appendChild(w_td);
	tr.appendChild(wo_td);

	document.getElementById('tgt').appendChild(tr);

	// [count, w_td. wo_td].map(td => tr.appendChild(td) );

	}

	window.onload = function() {
	[1e2, 1e3, 1e4, 1e5, 1e6, 1e7].map(n => for_n(n));
	}

	</script>
	</head>

	<body>
	<table>
	<thead><th>Count</th><th>With<br/>prealloc</th><th>Without<br/>prealloc</th></tr>
	<tbody id="tgt"></tbody>
	</table>
	</body>

	</html>