Run results for: Check if character is not a lowercase letter

Run details:

User agent: Mozilla/5.0 (Android 11; Mobile; rv:103.0) Gecko/103.0 Firefox/103.0

Browser: Firefox Mobile 103

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
regex	15863810.0 Ops/sec
alphaIncludes	21155020.0 Ops/sec
charCodeBetween	667592300.0 Ops/sec

Script Preparation code:

function regex(key) {
  return /[^a-z]/.test(key);
}

const alpha = "abcdefghijklmnopqrstuvwxyz";
function alphaIncludes(key) {
  return alpha.includes(key);
}

function charCodeBetween(key) {
  return key >= 97 && key <= 122
}

Tests:

regex
regex("s")
alphaIncludes
alphaIncludes("s")
charCodeBetween
charCodeBetween("s")

Run results for: Check if character is not a lowercase letter

regex test vs alphabet string includes vs charCodeAt

regex

alphaIncludes

charCodeBetween