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jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

Test case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

Preparation HTML
(this will be inserted in the <body> of a valid HTML5 document in standards mode)
(useful when testing DOM operations or including libraries)

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

function getFlagEmoji(countryCode) {
  return countryCode.toUpperCase().replace(/./g, char => 
      String.fromCodePoint(127397 + char.charCodeAt())
  );
}
getFlagEmoji('de')
getFlagEmoji('CH')

Test #2

Title *

Async

Code *

function getFlagEmoji(countryCode) {
  const codePoints = countryCode
    .toUpperCase()
    .split('')
    .map(char =>  127397 + char.charCodeAt());
  return String.fromCodePoint(...codePoints);
}
getFlagEmoji('de')
getFlagEmoji('CH')

Test #3

Title *

Async

Code *

function getFlagEmoji(countryCode) {
  return [...countryCode.toUpperCase()].map(char => 
      String.fromCodePoint(127397 + char.charCodeAt())
  ).reduce((a, b) => `${a}${b}`);
}
getFlagEmoji('de')
getFlagEmoji('CH')

Test #4

Title *

Async

Code *

function getFlagEmoji(countryCode) {
  return [...countryCode.toUpperCase()].map(char => 
      String.fromCodePoint(127397 + char.charCodeAt())
  ).reduce((a, b) => a + b);
}
getFlagEmoji('de')
getFlagEmoji('CH')

Test #5

Title *

Async

Code *

function getFlagEmoji(countryCode) {
  return [...countryCode.toUpperCase()].map(char => 
      String.fromCodePoint(127397 + char.charCodeAt())
  ).join('');
}
getFlagEmoji('de')
getFlagEmoji('CH')

Test #6

Title *

Async

Code *

function getFlagEmoji(countryCode) {
  const codePoints = countryCode
    .toUpperCase()
    .split("")
    .map((char) => 127397 + char.charCodeAt(0));
  return String.fromCodePoint(...codePoints);
}
getFlagEmoji('de')
getFlagEmoji('CH')