Run results for: string.slice vs regex

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 OPR/79.0.4143.22

Browser: Opera 79

Operating system: Windows 7

Device Platform: Desktop

Date tested: one year ago

slice

6K/s

array

1K/s

regex

336/s

View exact numbers

Script Preparation code:

const strings = [ 'onclick', 'onwheel', 'onresize', 'noclick', 'nowheel', 'noresize' ];
function getStrings() {
  return strings;
}

Tests:

regex
const regex = /^on/ for( let i = 0; i < 10000; i++ ) { getStrings().forEach( str => regex.test( str ) ); }
slice
for( let i = 0; i < 10000; i++ ) { getStrings().forEach( str => str.slice(0, 2) === 'on' ); }
array
for( let i = 0; i < 10000; i++ ) { getStrings().forEach( str => str[ 0 ] === 'o' && str[ 1 ] === 'n' ); }