Benchmark: check for a single character

HTML Preparation code:

<div></div>

Script Preparation code:

var data = window.data = [];
const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
var TOTAL_STRINGS = window.TOTAL_STRINGS = 100000;

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}

function makeRandomString(len) {
  var text = "";
  for( var i=0; i < len; i++ ) {
    text += possible.charAt(getRandomInt(possible.length));
  }
  return text;
}

while (data.length < TOTAL_STRINGS) {
  data.push(makeRandomString(getRandomInt(20)));
}

Tests:

startsWith
var x = 0; var y = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var regex = window.regex; while (x < TOTAL_STRINGS) { const str = data[x]; if (str.startsWith("A")) y += x; x += 1; }
.charAt
var x = 0; var y = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; if (str.charAt(0) === 'A') y += x; x += 1; }
charCodeAt
var x = 0; var y = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; if (str.charCodeAt(0) === 65) y += x; x += 1; }
string[]
var x = 0; var y = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; if (str[0] === 'A') y += x; x += 1; }
regex
var x = 0; var y = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; var re = /^A/; while (x < TOTAL_STRINGS) { const str = data[x]; if (re.test(str)) y += x; x += 1; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
startsWith
.charAt
charCodeAt
string[]
regex

check for a single character (version: 0)

Testing some things

Comparing performance of: startsWith vs .charAt vs charCodeAt vs string[] vs regex

Created: 7 months ago by: Guest

Jump to the latest result

startsWith

.charAt

charCodeAt

string[]

regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

No previous run results