Ten thousand arrays ,4 Duplicate items , First of all, post your grades .

1、3 millisecond

2、115 millisecond

3、71 millisecond

4、6 millisecond

1、 Hashtable

2、JQuery ( The fastest way is to use JQuery This sentence is a screenshot with ... actually Jq The slowest. )

3、indexOf

4、es6 es7

Test code

var num = 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99,9027,971,4768,9077,1613,2482,3860,8409,3291,5289,2924,9421,7038,7025,175,3324,5309,5408,4300,4000,1653,9658,6667,6986,7251,3601,8978,3760,4840,9265,3083,8533,574,276,9863,6053,240,8583,9318,2572,3889,4491,7543,1166,8872,7352,5237,744,3608,2889,8414,5960,2085,2756,8513,3495,6772,8667,6880,5259,7920,2809,8841,5003,2068,8045,5241,9895,5226,6344,2870,2443,7974,6761,5935,3493,6909,295,2620,5561,771,439,9174,8653,6241,166,9537,9065,320,9034,9967,664,7302,2451,3854,5375,6442,8446,9482,5630,9207,5676,2534,2822,8517,3851,9842,2590,3548,6801,3800,9986,5167,5105,791,7717,1840,895,1018,737,8457,2985,5988,5915,5374,5642,8399,5721,4263,1629,7102,5780,8303,4620,4984,1822,8627,1019,9400,2625,7419,4538,5199,3911,9816,1968,3674,8570,1045,9257,5954,2250,6781,6691,797,7348,5525,9022,3437,6192,4486,7338,9633,3818,663,1483,9864,775,2711,6815,8169,3313,8028,2927,5579,1669,8572,2097,8768,7450,2885,5297,7221,6768,5503,4633,597,9524,2210,9486,3312,8296,1425,6778,3877,8885,8817,7026,3432,8149,4506,3856,3896,2416,7325,7426,6673,2616,9170,5335,8256,6982,6980,1617,7027,8111,8938,2205,9028,5505,389,4553,3885,1313,4766,9441,6482,8561,4009,1595,3662,6655,29,3200,4114,7929,1480,1042,6459,9084,5276,1886,6624,2028,7374,1363,4376,9919,3998,1941,614,8694,1330,4386,3537,4884,71,4023,3556,5091,3292,3846,3321,1122,9078,4091,3463,3781,9529,2369,4179,4967,8368,599,760,4341,8679,8819,3454,3477,8741,6072,8996,3075,2513,1643,781,2732,72,5919,1412,5051,7691,4089,9870,3611,6855,6648,8862,2213,5448,7455,950,7575,9225,9006,5578,2760,8544,8,88,9103,4991,6030,9460,1242,6217,7344,4494,2657,2228,1265,1336,3629,5034,9443,5480,4695,9491,1511,9893,6211,8697,3959,288,1278,8268,709,7868,6775,5315,5788,1922,8001,1312,6319,5930,8116,401,4484,3742,4413,8715,7179,1947,7389,9008,7628,9278,8280,4177,3727,5210,9076,8474,4236,2356,3919,7932,4288,1403,5649,6068,6098,7564,719,2710,3729,3488,8681,2092,3966,3602,7674,2569,5150,2519,6817,1182,879,1713,7646,1641,2099,2261,4593,9467,4230,677,5713,4570,7986,2522,3142,3594,4760,6991,725,2331,3834,3568,9547,4858,9414,9046,2947,4218,2122,9002,2374,8300,5800,9187,6402,6380,5615,47,915,318,2224,7284,9356,3329,5586,492,521,4250,7332,360,1410,1437,3067,1314,4373,8626,7224,3496,2480,6846,8905,5230,1995,9688,6293,2082,4995,6592,9321,7062,7736,3562,243,8177,3305,5207,2804,3358,4521,2554,2742,2651,3050,2341,1147,9320,4875,5044,7570,2073,5668,1157,9873,2439,6613,344,7475,4661,1086,7114,195,1693,2050,156,5362,8013,2235,5925,5459,4147,7953,4562,2452,9512,7589,6314,1372,1889,3491,2448,5771,7097,6594,6674,3530,7048,4541,5252,9428,4917,224,5803,3180,523,6856,5161,7764,2340,165,2184,9140,8735,6955,1178,6302,6619,1392,4498,7987,2159,6140,3241,6864,4393,2112,6395,2317,5177,623,1807,1589,4979,6016,3779,1234,4733,102,2676,1967,1897,8157,5509,6172,6709,5965,7656,9235,3094,7526,4440,4066,6441,2185,3225,3822,3434,4838,8442,23,6535,5214,3603,2465,8015,4336,4064,7401,3600,1020,3065,2568,1485,8944,9393,5493,5468,6675,5365,51,8193,423,8424,3669,1190,5664,2801,1017,2767,2268,7197,3235,5337,5114,1293,7237,9569,3840,3675,7959,6458,1657,4861,4425,2928,8804,6549,7898,7459,9653,9041,545,384,5136,7039,5530,1175,3385,8305,2583,4344,202,4460,7923,3609,7398,8814,4032,4692,8563,3581,2651,693,8271,996,9124,222,7772,1544,9815,801,1866,2509,9548,3371,311,9220,9801,917,4337,1523,6424,802,1974,5389,2939,3960,6574,9614,7063,1250,2370,2379,3693,6625,3837,6465,1760,8128,8493,7773,9685,9136,2074,9453,6892,9781,5559,2754,8523,6967,8110,4600,1411,4108,3783,7964,1490,9927,7178,9867,2957,2106,4212,7753,6146,9962,6110,5718,7343,3934,7619,8050,7160,1660,2243,5735,4783,6623,5128,5994,2830,541,8295,2714,6528,5300,7686,5386,8248,3204,6036,1592,7763,8229,6678,3991,1383,8496,9,7311,969,6939,2176,9692,2748,9753,8213,2805,4845,7613,6331,2170,10,1891,8143,5438,8516,8278,5483,8172,6044,7806,6017,6035,6901,4131,4653,4828,3099,3242,8349,6526,1123,1770,3529,990,9770,2654,3622,2648,4950,7217,7037,9505,1609,4193,4112,845,6958];
function uniArray_1(arr){
var result = [],hash = {};
for(var i=0,elem;(elem = arr[i])!=null;i++){
if(!hash[elem]){
result.push(elem);
hash[elem] = true;
}else{
console.log(elem);
}
}
return result;
}
function uniArray_2(arr){
var result = [];
$.each(arr,function(i,el){
// console.log(el);
if($.inArray(el,result) === -1){
result.push(el);
}else{
console.log(el);
}
})
return result;
}
function uniArray_3(arr){
var result = [];
for(var i=0;i<arr.length;i++){
var elem = arr[i];
if(result.indexOf(elem) < 0){
result.push(elem);
}else{
// console.log(elem);
}
}
return result;
} // Time to timestamp ( millisecond )
function time2stamp(){
var d = new Date();
return Date.parse(d)+d.getMilliseconds();
} var t1 = time2stamp(); // $tmp = uniArray_1(num);
// $tmp = uniArray_2(num);
// $tmp = uniArray_3(num); // $tmp = Array.from(new Set(num));
$tmp = [...new Set(num)]; var t2 = time2stamp();
alert(" Time consuming :" + (t2 - t1) + " millisecond ");

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