Run results for: nodeType vs instanceof

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:129.0) Gecko/20100101 Firefox/129.0

Browser: Firefox 129

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

instanceof

23.2M/s

nodeType literal

23.1M/s

nodeType

20.5M/s

View exact numbers

Test name	Executions per second
✓ instanceof	23,168,934 Ops/sec
nodeType literal	23,052,840 Ops/sec
nodeType	20,494,020 Ops/sec

Script Preparation code:

var xs = [];
var n = 0;

for (let i = 0; i < 1000; ++i) {
  xs[i] = (Math.random() > .5) ? document.createElement(`a`) : document.createTextNode(``);
};

Tests:

nodeType
n += (xs[(Math.random() * 1000)|0].nodeType === Node.ELEMENT_NODE)|0;
instanceof
n += ((xs[(Math.random() * 1000)|0]) instanceof HTMLElement)|0;
nodeType literal
n += (xs[(Math.random() * 1000)|0].nodeType === 1)|0;