Run results for: str[i] before startsWith (6 cases)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:95.0) Gecko/20100101 Firefox/95.0

Browser: Firefox 95

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
[MATCH] check str[i] before startsWith	50296240.0 Ops/sec
[MATCH] startsWith immediatly	51596100.0 Ops/sec
[NOT MATCH] check str[i] before startsWith	1406511000.0 Ops/sec
[NOT MATCH] startsWith immediatly	52832240.0 Ops/sec
[NOT MATCH] check too far str[i] before startsWith	6786487.0 Ops/sec

Script Preparation code:

function get_data(){
  const res = "abc-def-ghi-\u26C6-jkl-mno"
  return res
}

Tests:

[MATCH] check str[i] before startsWith
const str = get_data() const res = str[12] === "\u26C6" && str.startsWith("abc-def-ghi-\u26C6")
[MATCH] startsWith immediatly
const str = get_data() const res = str.startsWith("abc-def-ghi-\u26C6")
[NOT MATCH] check str[i] before startsWith
const str = get_data() const res = str[14] === "\u26C6" && str.startsWith("abc-def-ghi-x-\u26C6")
[NOT MATCH] startsWith immediatly
const str = get_data() const res = str.startsWith("abc-def-ghi-x-\u26C6")
[NOT MATCH] check too far str[i] before startsWith
const str = get_data() const res = str[30] === "\u26C6" && str.startsWith("abc-def-ghi-\u26C6")