Run results for: Find duplicates and return

Test name	Executions per second
✓ Duplicates set	5,706 Ops/sec
Index of	860 Ops/sec

Tests:

Index of
const array = 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const duplicates = array.filter((v, idx) => array.indexOf(v) !== idx);
Duplicates set
const array = 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729,4428,5845,1021,1192,5426,5321,5521,5753,5653,2399,3562,774,4544,3227,3190,807,520,3361,4954,3978,3211,2119,680,750,5056,2686,2452,2818,3669,114,1112,3133,2370,4971,2067,2149,361,5504,4632,790,4678,3856,4016,2289,4727,4658,2280,5150,944,4396,1376,1530,5676,4672,850,3815,914,3149,4332,4950,2953,2269,251,5309,596,5019,4204,2516,2594,4119,992,1301,2809,690,2383,318,2656,2332,5978,1412,4728,3582,693,1377,1602,5551,2780,1309,5399,2189,1506,2814,4272,2514,5172,2875,1280,2366,1694,4134,4504,3675,1674,3109,426,2275,215,3589,2071,4507,2523,2847,98,1738,589,2126,5695,3145,4839,2448,5620,2664,3659,4225,1961,4137,1520,369,1187,4838,956,4604,1974,3056,5743,2033,2384,4518,5886,569,5834,4598,4362,3051,2825,5010,967,3232,2626,1241,2783,164,128,1556,2183,3238,5010,2417,3213,4169,5010,5080,5570,5125,580,5080,1112,4750,1786,5561,5091,2401,683,1761,4495,3639,3807,4917,5081,1165,5244,5687,3377,5406,3412,2673,4531,5726,3432,178,149,3576,5822,455,187,1717,326,4987,3664,5254,2445,2696,5352,5233,4002,1095,3234,5766,3840,806,1274,1968,5126,4321,1680,2387,1975,2823,3978,1487,510,1943,1166,3163,503,704,2377,1054,2949,2135,4445,2707,4358,1652,1610,3115,2110,5629,747,1972,3146,2861,656,3605,4160,5657,2126,3865,594,768,2589,3411,5567,1284,121,2505,657,5914,4726,3320,2075,3815,3486,1347,3433,1733,3636,1455,4045,5782,1816,3349,5495,3354,381,1411,1231,1964,4447,4451,1074,4967,1764,3057,2576,3785,5582,182,2357,5054,417,524,3286,254,2927,4847,4341,2464,5132,3803,5123,872,2976,1931,1992,3898,5621,5739,5748,1203,1723,1716,5153,3133,1565,2080,1517,5304,5756,4572,250,608,1085,62,318,1625,726,5138,2336,4830,3777,717,3199,4228,3638,2578,3707,1106,5640,3067,24,1618,4576,2999,2968,914,2800,502,5358,153,1859,4457,5546,2018,5332,1602,2389,1470,464,5398,1070,1728,241,3763,52,4997,2294,1467,438,1427,3666,5636,5378,4708,5275,4320,2556,2707,4185,1776,5802,1114,2291,4926,3928,3449,5294,1732,503,2925,607,1359,3571,5968,5310,474,1859,3943,4259,1553,4603,520,5928,584,5504,4330,240,2403,1318,746,4840,5922,1229,3704,4968,828,482,5957,1787,1828,5471,3312,4534,481,2594,5056,5982,5198,1102,5695,1093,501,663,2372,5975,1491,5610,1555,1538,4253,248,3883,634,2646,4043,28,5042,2194,1971,1386,3126,885,5611,2280,2595,1906,197,1476,4194,3624,2450,5379,5471,4250,5787,2963,4068,200,3968,3797,4799,995,117,315,1868,601,4970,2074,614,1954,5899,487,5564,1401,3908,1651,5963,4512,3196,5172,3951,762,4176,4699,5713,3050,964,1989,14,231,4593,3356,3940,2534,4133,2023,2226,2674,1731,4739,2476,1641,1955,2867,5279,5897,4803,4159,3555,4461,3559,1822,1852,5330,756,2,178,1856,2394,4009,3809,5708,3128,3558,1162,401,5308,1870,2574,4670,800,4271,2953,5280,1054,5353,3832,1157,1898,980,5051,3818,197,3021,4363,3221,5334,5448,5028,2504,3545,4539,4967,3747,3096,601,634,2387,2537,4654,2906,1576,5453,4045,1886,4281,4483,4185,1024,4638,3986,3636,485,3851,3075,5693,1034,2100,3274,901,766,1394,1029,962,3943,4518,4957,2460,4764,5969,5904,5559,2626,2742,3175,4715,4016,2817,181,2114,4319,1337,3766,4145,565,5542,4436,1654,3343,3008,3010,1346,737,1227,2882,5010,2367,5039,2931,2864,5310,2792,4917,1871,552,2434,5757,2559,3552,4374,1939,913,792,3140,5691,1292,3666,4539,1273,2444,2023,1261,1097,1312,3178,3928,5742,1556,3490,1834,4134,5248,4390,1102,2460,2911,5239,5698,5118,4325,4732,1137,4343,4811,2125,3574,4754,5942,4392,4099,4002,521,3883,5380,1304,5211,2689,3625,4128,5495,3382,2098,1073,4791,2866,313,4044,5470,2288,905,2495,3796,5609,1563,5401,4280,1427,8,5650,3748,4353,410,1340,55,5507,174,2116,4922,4005,5177,4767,4905,4191,245,5224,5078,5326,4273,4421,4549,4683,1277,4654,5600,221,347,3267,2253,4540,331,222,4204,1621,5701,334,5908,2744,2976,363,1653,403,946,5108,4918,2260,3660,4204,5427,5615,4638,2176,2765,1488,4374,646,5651,2194,2269,419,4104,1110,927,5854,5010,5237,2051,2871,4119,1414,4852,2842,3556,2303,5703,494,703,5954,5168,1778,1587,5515,3734,1151,3702,3170,4164,4964,4652,3423,3013,1884,2050,3109,2174,5490,3520,3647,3047,535,4378,912,4478,1722,4691,4031,4404,3341,3363,1974,1823,3596,5885,1968,4970,1087,2752,2522,5077,5283,2566,5641,1262,5557,4111,164,321,1705,3492,2470,4078,2873,201,4568,5815,5378] const duplicates = new Set(); const seen = new Set(); array.forEach((v) => { if (seen.has(v)) { duplicates.add(v); } else { seen.add(v); } });

Run results for: Find duplicates and return

Index of

Duplicates set