Run results for: string.charCodeAt(index) vs string[index].charCodeAt()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

charCodeAt(300)

32.0M/s

charCodeAt(0)

31.8M/s

[0].charCodeAt()

24.1M/s

[300].charCodeAt()

23.9M/s

View exact numbers

Test name	Executions per second
✓ charCodeAt(300)	31,957,028 Ops/sec
charCodeAt(0)	31,846,490 Ops/sec
[0].charCodeAt()	24,080,684 Ops/sec
[300].charCodeAt()	23,939,364 Ops/sec

Script Preparation code:

var str = "some string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string heresome string here"

Tests:

charCodeAt(0)
str.charCodeAt(0)
charCodeAt(300)
str.charCodeAt(300)
[0].charCodeAt()
str[0].charCodeAt()
[300].charCodeAt()
str[300].charCodeAt()