Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.55 Safari/537.36
Chrome 96
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
character index 7203881.5 Ops/sec
charAt() 7220289.0 Ops/sec
slice() 7037249.0 Ops/sec
Script Preparation code:
AخA
 
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();