Run results for: Better number parsing

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser: Chrome 108

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Betterparse type 1	34095.2 Ops/sec
Betterparse type 2	32126.4 Ops/sec
Standard parsing (incorrect)	61317.9 Ops/sec
Standard parsing 2 (incorrect)	58677.4 Ops/sec
Betterparse type 3	31209.8 Ops/sec

Script Preparation code:

var betterparse1 = (s) => {
    // special case handling of literal "nan" values
    s = s.toLowerCase()
    if (s === "nan" || s === "-nan" || s === "+nan") return NaN;

    const v = Number(s);
    if (isNaN(v)) return null;
    return v; // guaranteed to be a number that isn't NaN (but it could be Infinity)
}

var betterparse2 = (s) => {
    // special case handling of literal "nan" values
    switch (s.toLowerCase()) {
      case "nan":
      case "+nan":
      case "-nan":
        return NaN;
    }

    const v = Number(s);
    if (isNaN(v)) return null;
    return v; // guaranteed to be a number that isn't NaN (but it could be Infinity)
}

var betterparse3 = (s) => {
    switch (s) {
      case "nan":
      case "+nan":
      case "-nan":
      case "NaN":
      case "+NaN":
      case "-NaN":
      case "NAN":
      case "+NAN":
      case "-NAN":
        return NaN;
    }

    const v = Number(s);
    if (isNaN(v)) return null;
    return v; // guaranteed to be a number that isn't NaN (but it could be Infinity)
}

var numbers = [
    "0.327257347992157",
    "0.03432947163666622",
    "0.19054570522014136",
    "0.757924325036481",
    "0.8756495827150409a",
    "0.8735223786857549",
    "0.16193166094499645",
    "0.3264840252931367",
    "0.8976069804818312",
    "0.05823493932681134",
    "0.9467170087775896",
    "-NAN",
    "0.3411182773746414",
    "0.04273697798010612",
    "0.4599136076509416",
    "0.20091841618072792",
    "0.7481790478470371",
    "0.631090589202488",
    "0.6134529272259946",
    "0.7603019894148221",
    "NaN",
    "0.6848452952886251",
    "0.8958221077246171",
    "0.25265763361084415",
    "0.31674875667294267",
    "0.6097282060031768",
    "0.18265134080263656",
    "",
    "0.36918250030559796",
    "0.6053164008875728",
    "0.39730683023873337",
    "0.3842390211966774",
    "0.5573411172870547",
    "b0.9682358615780161",
    "0.8304492155340027",
    "0.1464933423860405",
    "0.26340608593749726",
    "0.22961410590320552",
    "0.5908943588693252",
    "0.9002256812711459",
    "0.8092150249145922",
    "0.060955373278098635",
    "0.04253202590541827",
    "0.4994387689297176",
    "0.05581701909464065",
    "0.01981156164547493",
    "0.12833340391640402",
    "NaN",
    "0.465050111507027",
    "0.7636969664726854",
    "0.12864577854450943",
    "0.47847392755062357",
    "0.09313181128668402",
    "0.9473000507174908",
    "0.869188703023482",
    "0.8476349098291822",
    "0.5060602000203033",
    "0.013594390816120128",
    "NaN",
    "0.7159481390807573",
    "0.9785693256013818",
    "0.6567281886346458",
    "0.2741853723406986",
    "0.08134454100211075",
    "0.16720862159533767",
    "0.043608322437359126",
    "NaN",
    "0.7552857256174752",
    "0.10191443424045554",
    "0.6683869703195341",
    "0.1672931087637095",
    "0.029535244526663784",
    "+nan",
    "0.9038827319929565",
    "0.9580917987405422",
    "0.33091435472002173",
    "0.6400233200277594",
    "dfsgsegrsert",
    "0.39558554444217287",
    "0.6817925156801317",
    "0.7543418101559722",
    "0.8112443776211025",
    "0.4746963996832825",
    "0.4970739670176436",
    "0.6522344216702008",
    "0.37851252385904544",
    "0.9145354809581934",
    "0.17983840765587844",
    "0.5632683939437284",
    "0.2581147343499265",
    "0.5593935878390675",
    "0.14874151599102725",
    "0.32513087795909557",
    "0.253zxxxzz77838496",
    "0.9299155933721135",
    "0.7609785538234373",
    "0.6181474622979708",
    "0.9775946358910067",
    "0.07623977301767593",
    "0.7534482258293359",
];

Tests:

Betterparse type 1
let x; for (const s of numbers) { x = betterparse1(s); }
Betterparse type 2
let x; for (const s of numbers) { x = betterparse2(s); }
Standard parsing (incorrect)
let x; for (const s of numbers) { x = Number(s); }
Standard parsing 2 (incorrect)
let x; for (const s of numbers) { x = parseFloat(s); }
Betterparse type 3
let x; for (const s of numbers) { x = betterparse2(s); }

Run results for: Better number parsing

Betterparse type 1

Betterparse type 2

Standard parsing (incorrect)

Standard parsing 2 (incorrect)

Betterparse type 3