Run results for: String isNullOrWhitespace

Run details:

User agent: Mozilla/5.0 (Linux; Android 12; SM-G998B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.58 Mobile Safari/537.36

Browser: Chrome Mobile 99

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Trim	77915.3 Ops/sec
RegExp	25456.4 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