Convert byte array to hex string (v8)

Revision 8 of this benchmark created by Gion on

Description

Also included functional style (i know this site is about performance and it's slower but it's so much more readable)

Setup

var byteArrayData = [],
      i = 0;
    while (i < 10000) {
      byteArrayData.push(Math.floor(Math.random() * 255));
      i++;
    }

Teardown


    byteArrayData = [];

Test runner

Ready to run.

Testing in
TestOps/sec
String length compare
var ret = "",
  i = 0,
  len = byteArrayData.length;
while (i < len) {
  var h = byteArrayData[i].toString(16);
  if (h.length < 2) {
    h = "0" + h;
  }
  ret += h;
  i++;
}
ready
Byte value compare inline.
var ret = "",
  i = 0,
  len = byteArrayData.length;
while (i < len) {
  var a = byteArrayData[i];
  var h = (a < 10 ? "0" : "") + a.toString(16);
  ret += h;
  i++;
}
ready
Byte value compare expanded
var ret = "",
  i = 0,
  len = byteArrayData.length;
while (i < len) {
  var a = byteArrayData[i];
  var h = a.toString(16);
  if (a < 10) {
    h = "0" + h;
  }
  ret += h;
  i++;
}
ready
Functional style
var ret = byteArrayData.reduce(function(hex, b) {
  return hex + (b < 16 ? '0' : '') + b.toString(16);
}, '');
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.