Run results for: parseInt vs charCodeAt

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

charCodeAt

1.9M/s

parseInt

1.3M/s

View exact numbers

Test name	Executions per second
✓ charCodeAt	1,941,533 Ops/sec
parseInt	1,343,294 Ops/sec

Script Preparation code:

var strings = [
    "6",
    "4",
    "3",
    "4",
    "1",
    "1",
    "5",
    "4",
    "1",
    "3",
    "2",
    "2",
    "5",
    "7",
    "1",
    "2",
    "1",
    "0",
    "5",
    "7",
    "4",
    "5",
    "0",
    "5",
    "1",
    "0",
    "4",
    "1",
    "7",
    "7",
    "0",
    "4",
    "0",
    "6",
    "3",
    "7",
    "7",
    "7",
    "5",
    "0",
    "0",
    "5",
    "0",
    "3",
    "3",
    "0",
    "5",
    "0",
    "2",
    "6",
    "2",
    "3",
    "3",
    "6",
    "2",
    "3",
    "0",
    "5",
    "5",
    "5",
    "6",
    "2",
    "3",
    "4",
    "4",
    "0",
    "7",
    "2",
    "3",
    "2",
    "6",
    "1",
    "4",
    "1",
    "1",
    "6",
    "5",
    "7",
    "4",
    "2",
    "5",
    "4",
    "6",
    "3",
    "4",
    "5",
    "4",
    "6",
    "1",
    "0",
    "3",
    "4",
    "7",
    "1",
    "0",
    "5",
    "4",
    "5",
    "3",
    "6"
];

Tests:

parseInt
for (let s of strings) { let a = parseInt(s[0]); }
charCodeAt
for (let s of strings) { let a = s.charCodeAt(0) - 48; }