Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36 Edg/89.0.774.57
Chrome 89
Windows
Desktop
3 years ago
Test name Executions per second
character index 7815866.0 Ops/sec
charAt() 7839689.5 Ops/sec
slice() 7034027.0 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();