Run results for: Comparison of Request copy

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser: Chrome 107

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
[string, object] - instanceof	2467330.5 Ops/sec
[string, object] - typeof	7027509.0 Ops/sec
[url, object] - instanceof	2457548.5 Ops/sec
[url, object] - typeof	6949564.5 Ops/sec
[request] - instanceof	55517.7 Ops/sec
[request] - typeof	23954.4 Ops/sec
[string, request] - instanceof	52720.5 Ops/sec
[string, request] - typeof	24761.9 Ops/sec

Script Preparation code:

var rawStringFetchArgs = ['http://test.com', { method: 'post', body: JSON.stringify({ property: 'value' }) }]
var urlObjectFetchArgs = [new URL('http://test.com'), { method: 'post', body: JSON.stringify({ property: 'value' }) }]
var requestObjectFetchArgs = [new Request('http://test.com', { method: 'post', body: JSON.stringify({ property: 'value' }) })]
var requestObjectSecondFetchArgs = ['http://test.com', new Request('http://test.com', { method: 'post', body: JSON.stringify({ property: 'value' }) })]

function cloneWithInstanceOf(args) {
  return args.map(arg => arg instanceof Request ? arg.clone() : arg)
}

function cloneWithTypeOf(args) {
  return args.map(arg => !!arg && typeof arg === 'object' && arg.clone && typeof arg.clone === 'function' ? arg.clone() : arg)
}

Tests:

[string, object] - instanceof
cloneWithInstanceOf(rawStringFetchArgs)
[string, object] - typeof
cloneWithTypeOf(rawStringFetchArgs)
[url, object] - instanceof
cloneWithInstanceOf(urlObjectFetchArgs)
[url, object] - typeof
cloneWithTypeOf(urlObjectFetchArgs)
[request] - instanceof
cloneWithInstanceOf(requestObjectFetchArgs)
[request] - typeof
cloneWithTypeOf(requestObjectFetchArgs)
[string, request] - instanceof
cloneWithInstanceOf(requestObjectSecondFetchArgs)
[string, request] - typeof
cloneWithTypeOf(requestObjectSecondFetchArgs)

Run results for: Comparison of Request copy

[string, object] - instanceof

[string, object] - typeof

[url, object] - instanceof

[url, object] - typeof

[request] - instanceof

[request] - typeof

[string, request] - instanceof

[string, request] - typeof