Run results for: char index vs charAt() vs slice()

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.1.0; 5041C Build/OPM1.171019.011;) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36

Browser: Chrome Mobile 66

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
character index	278591.8 Ops/sec
charAt()	305497.3 Ops/sec
slice()	266019.1 Ops/sec

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();

Run results for: char index vs charAt() vs slice()

Compare methods for testing string's beggining character.

character index

charAt()

slice()