Run results for: char index vs charAt() vs slice() vs at() - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/117.0

Browser: Firefox 117

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
character index	184952500.0 Ops/sec
charAt()	164160900.0 Ops/sec
slice()	130657800.0 Ops/sec
at()	102388500.0 Ops/sec

Website performance monitoring

Script Preparation code:

var str = 'foo bar baz';
var noop = Function.prototype;

Tests:

character index
if (str[0] === 'f') noop();
charAt()
if (str.charAt(0) === 'f') noop();
slice()
if (str.slice(0, 1) === 'f') noop();
at()
if (str.at(0) === 'f') noop();