duktape/ecmascript-testcases/test-conv-number-tostring-tonumber-roundtrip.js

/*
 *  Test that ToNumber(ToString(x)) === x, except for -0 where the sign is
 *  lost.  This is not required, but very preferable.
 */

/*---
{
    "knownissue": "rounding corner cases"
}
---*/

var values = [
    // Some basic values
    Number.NEGATIVE_INFINITY,
    -1e100,
    -98765432109876543210.9876543210,
    -123456789.01234567890123456789,
    -1, -0, 0, 1,
    123456789.01234567890123456789,
    98765432109876543210.9876543210,
    1e100,
    Number.POSITIVE_INFINITY,
    Number.NaN,

    // Random numbers generated with Node and:
    //
    // for (var i = 0; i < 1000; i++) { console.log(Math.exp(Math.random() * 200 - 100)); }

    9.47885972948749e+39,
    2.6532555092896124e-38,
    6758389328007.754,
    10628584993.157171,
    2.6387756640974324e-14,
    1.7009553077579215e+22,
    9.09378225144655e-8,
    2.570245047158704e+33,
    1.9396386619107822e-16,
    6.73978643029618e+30,
    23023475.15899063,
    2.944663902929539e+36,
    8.765212372975559e+33,
    2.0281186554367569e+30,
    3162760770626405.5,
    2.511274146889772e+28,
    8.273496767055383e+26,
    7315.408519400525,
    1.2453729136986092e+31,
    2.1488528837888795e-14,
    207831500826.3388,
    8.467475251390892e+28,
    160140468041.11798,
    2317443293048.422,
    2.626896285281776e-40,
    2.594342974576634e+35,
    2.560414490937443e-11,
    25378617.623473298,
    2.5086804709066974e+42,
    15164278368312.924,
    4.217769679901025e+22,
    137.70455950632692,
    1.0548485556959191e-15,
    7.88141881125595e-21,
    6.599780780745824e-42,
    2.322325270214259e-27,
    2.0461779359754773e-33,
    1.838590481791029,
    1.2315098521695652e+28,
    29365216.899717223,
    1.8001999764457677e-43,
    21290712747578480,
    3.677207262793838e-14,
    1.648593206994196e-23,
    1185481181649142800,
    9.596424686955204e-35,
    4.859110177701829e-19,
    9.984892831955197e-38,
    3718356750368012.5,
    1.479854978525036e-18,
    9.22461085881936e-38,
    9.691971681128414e-13,
    116857149.18747038,
    4.598053300885936e-30,
    1.5643595682150466e-20,
    34310480000.875927,
    1.589379365466063e-23,
    2.86992846730546e-26,
    21.40464114985228,
    0.000004996221917552839,
    8.927342560451363e+41,
    1.841921770591009e-38,
    9.155549677555242e+21,
    0.00043778433690965077,
    240473519618175.78,
    2.0914968630022918e-30,
    429136.9588103832,
    5.395161976218836e-26,
    1.142133604058351e+23,
    1.8562515444810014e-36,
    1.99914335068539e-26,
    3.793450432146888e+36,
    4.007678784637975e-18,
    1.4058148134409361e-14,
    2.3048131860111467e-38,
    1.1277210513016002e+25,
    5.642142384495337e+39,
    5.641360878806083e-41,
    1.5842289268233725e-9,
    80101487.0206429,
    452674066963903700000,
    2.0268223440670318e-31,
    36.44390739434274,
    71969389276008700000,
    2.4846406732254622e-20,
    4.0231679528554584e-28,
    3.804351513120633e-23,
    1.0781924461124128e-20,
    7.344859248893897e-8,
    4.403703286249895e-20,
    1.7392485650115742e-23,
    4.921032261162188e-15,
    4929271822697.627,
    45926331875.24537,
    5.386658157398103e+34,
    1.6607384850645418e-10,
    1936096341068.3835,
    220987060.0482705,
    1.7405833116858833e-9,
    8.213482547587643e+28,
    3.310318575828092e-21,
    3.183002715787965e+21,
    7.197732536389885e-43,
    1.9326708934562343e-16,
    0.004496917544921244,
    7.983458506100303e+23,
    0.31405549198915556,
    1937244739.9472232,
    2.6385092363838773e-30,
    6.593841600966287e+26,
    4.901829130741176e+31,
    9.538720591254787e-30,
    2.9538540487017115e-39,
    1.114440513687204e+25,
    1.2758427724245513e-13,
    0.0000137847414380527,
    1.927820260547553e-26,
    172645928638300740,
    959903779.5509624,
    2.8226648717647724,
    1.3774358925598547e-20,
    1.870450853361116e-35,
    6402561.449475099,
    9948788829888060000,
    3.233972832174404e-27,
    7.079676411437938e-13,
    3.0502404894688147e+41,
    23455607645329332,
    2.957168347382617e+21,
    5.519925273460977e-24,
    2.6680962229936957e+31,
    3.625029985340905e-11,
    2.6513955655572123e-43,
    8.812648092763192e+40,
    1.9875687741639483e-10,
    2.272450621607019e-28,
    0.028219159841700068,
    0.00004073766236272613,
    251046023700898680000,
    5.0910594200681556e+38,
    5411912555997676,
    1.3618279894882253e+43,
    1.7318743462926325e-33,
    4.870759398349554e-8,
    7.164875969910862e-35,
    10095636711842.91,
    217369360224245840000,
    0.00010828643494654476,
    4.680332052636842e+25,
    4.824208776804383e-18,
    6.682096501766571e-17,
    2.702283917297994e-43,
    4.641541678646538e-20,
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    1.0086571722661292e-12,
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    0.0000034075066715415917,
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    0.023595887878547897,
    4.177380454441682e-14,
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    4.96670149558718e-33,
    0.5247970677156614,
    15890740495.670502,
    1.3136269351136367e-8,
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    1.2031428208597315e-20,
    1.0847421373256445e-10,
    2.3025741455312388e+36,
    2.096784586120349e-22,
    0.0000026836631355521113,
    1.0044394840031275e-43,
    1.971522986159444e-34,
    5.168505395368058e-29,
    138359480.23802164,
    23024420.783052843,
    1.5865672938359943e+36,
    3.156218188171681e-43,
    8.022706842469358e-31,
    43005421420.40497,
    160001310639123970,
    4160768457433803.5,
    2.808282637754872e-12,
    1.0828621102700475e-17,
    2.5167599734560993e+36,
    6.803540547128114e-17,
    2.325021177702014e-24,
    0.0004234470228008734,
    4.980943502928653e-13,
    4.512232760408178e-31,
    847.4690099058901,
    0.008177902894893145,
    0.04492015064922013,
    0.002658687165770774,
    3.3600209546015584e+25,
    3372.4973987003823,
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    8.606362714516306e+29,
    4.634054846942846e-37,
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    1.1608161279558315e-25,
    1.999936091264257e-40,
    430.0332240390734,
    5.0887686940409796e-39,
    8739784703.401863,
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    2.185731295740616e-15,
    12.338744881642135,
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    386476513650954.9,
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function sign(x) {
    if (x !== 0) { return (x < 0 ? -1 : 1); }
    if (1 / x > 0) { return 1; }
    return -1;
}

function fmt(x) {
    if (x === 0) { return (1 / x > 0 ? '0' : '-0'); }
    return String(x);
}

/* The negative zero test fails intentionally: ToString() doesn't print out
 * the sign of a negative zero.
 */
/*===
fail 5 -0 0 0
===*/

function roundTripTest() {
    var i;
    var num1, str, num2;
    var fail;

    for (i = 0; i < values.length; i++) {
        num1 = values[i];
        str = num1.toString();
        num2 = Number(str);

        // Careful when comparing: even strict equality has (-0 === 0 => true).
        // On the other hand NaNs are never equal.

        fail = false;
        if (isNaN(num1) || isNaN(num2)) {
            if (!(isNaN(num1) && isNaN(num2))) {
                fail = true;
            }
        } else if (num1 === 0 && num2 === 0) {
            if (!(sign(num1) === sign(num2))) {
                fail = true;
            }
        } else if (num1 !== num2) {
            fail = true;
        }

        if (fail) {
            print('fail', i, fmt(num1), str, fmt(num2));
        }
    }
}

try {
    roundTripTest();
} catch (e) {
    print(e.stack || e);
}