Run results for: nodeType vs instanceof

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:81.0) Gecko/20100101 Firefox/81.0

Browser: Firefox 81

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
nodeType	3356512.5 Ops/sec
instanceof	3009291.8 Ops/sec
nodeType literal	5338977.0 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;

Run results for: nodeType vs instanceof

nodeType

instanceof

nodeType literal