Run results for: String isNullOrWhitespace

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Trim	93113.4 Ops/sec
RegExp	45577.9 Ops/sec

Script Preparation code:

const strings = [];

for (let i = 0; i < 1000; ++i) {
  const string = i % 2 === 0 ? '    ' : (Math.random() * 100000).toFixed(0).toString()
  strings.push(string);
}

window.strings = strings;

Tests:

Trim
function isNullOrWhitespace(str) { return !str || !str.trim(); } window.strings.forEach(string => isNullOrWhitespace(string));
RegExp
const regExp = /^ *$/; function isNullOrWhitespace(str) { return !str || regExp.test(str); } window.strings.forEach(string => isNullOrWhitespace(string));

Run results for: String isNullOrWhitespace

Test is fastest way to detect isNullOrWhitespace

Trim

RegExp