Run results for: Custom Build Query 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
URLSearchParams	1544708.1 Ops/sec
Custom (safe)	1561038.0 Ops/sec
Custom 2 (unsafe)	5033470.0 Ops/sec
Custom (fast)	3234752.2 Ops/sec

Script Preparation code:

var querystring = 'foo=bar&baz=qux&quxx=corge&grault=garply&waldo=fred&plugh=xyzzy'

var queryobj = {
  foo: 'bar',
  baz: 'qux',
  quux: 'corge',
  grault: 'garply',
  waldo: 'fred',
  plugh: 'xyzzy'
}

function encode(data) {
  let result = '?'

  for (const key in data) {
    if (data[key] != null) {
      result += key + '=' + data[key] + '&'
    }
  }

  return result.slice(0, -1)
}

function encodeNative(data) {
  return new URLSearchParams(data).toString()
}

function buildQueryString(params) {
  const query = Object.entries(params)
    .filter(([_, value]) => value !== undefined && value !== null)
    .map(([key, value]) => `${key}=${encodeURIComponent(String(value))}`)
    .join('&');

  return query ? `?${query}` : '';
}

function fastBuildQueryString(params) {
  let result = '?';
  let first = true;
  
  for (const key of Object.keys(params)) {
    const value = params[key];
    if (value != null) {
      if (!first) result += '&';
      result += key + '=' + encodeURIComponent(String(value));
      first = false;
    }
  }
  
  return first ? '' : result;
}

Tests:

URLSearchParams
encodeNative(queryobj)
Custom (safe)
buildQueryString(queryobj)
Custom 2 (unsafe)
encode(queryobj)
Custom (fast)
fastBuildQueryString(queryobj)

Run results for: Custom Build Query 2

URLSearchParams

Custom (safe)

Custom 2 (unsafe)

Custom (fast)