10 examples of 'js array unique' in JavaScript

33
function unique (array) {
34
  var res = []
35
36
  for(var i = 0,iL = array.length;i < iL;i++) {
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    var current = array[i]
38
    if(res.indexOf(current) === -1) {
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      res.push(current)
40
    }
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  }
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  return res
44
}

23
function unique(array){
24
    var o = {};
25
    for(var i=0; i<array.length; i++){
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        var item = array[i];
27
        //判断字典中是否已经存在该值
28
        //如果不存在  = 1
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        //如果存在  + 1
30
        if(o[item]){
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            o[item]++;
32
        }else{
33
            o[item] = 1;
34
        }
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    }
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    // 删掉原来的数组
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    array = null;
38
    // 去重后的新数组
39
    var newArray = [];
40
    for(var key in o) {
41
        newArray.push(key);
42
    }
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    return newArray;
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}

228
export function arrayUnique(array) {
229
  let unique = [];
230
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  arrayEach(array, (value) => {
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    if (unique.indexOf(value) === -1) {
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      unique.push(value);
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    }
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  });
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  return unique;
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}

19
function unique(array) {
20
	var n = -1;
21
22
	while (++n < array.length) {
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		remove(array, array[n], n);
24
	}
25
26
	return array;
27
}

104
function arrayUniqueTest() {
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  // var target = [1, 2, 3, 3, '3', '3', 'length', '__proto__', 'prototype', true, false, true, {}, {}, null, null];
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  var target = [1, 2, 3, 3, '3', '3', '__proto__', '__proto__', '__proto__', 'prototype', 'prototype', true, false, true, {}, {}, null, null];
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  // var target = [1, '1', true, 'true'];
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  console.log('\narrayUnique test:\n', arrayUnique(target));
109
}

927
function unique2(array){
928
  var n = {}, r = [], len = array.length, val, type;
929
    for (var i = 0; i < array.length; i++) {
930
        val = array[i];
931
        type = typeof val;
932
        if (!n[val]) {
933
            n[val] = [type];
934
            r.push(val);
935
        } else if (n[val].indexOf(type) < 0) {
936
            n[val].push(type);
937
            r.push(val);
938
        }
939
    }
940
    return r;
941
}

77
function unique(array) {
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	return array.filter(function (item, idx) {
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		return array.indexOf(item) === idx;
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	});
81
}

53
function unique2(array){
54
    var res = [];
55
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    for(var i =0; i<array.length;i++){
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        var item = array[i];
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        for(var j= 0; j < res.length; j++){
59
            if(res[j] === item){
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                break;
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            }
62
        }
63
        if(j === res.length){
64
            res.push(item);
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        }
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    }
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    return res;
68
}

392
function unique(arr) {
393
    return removeDuplicates(arr);
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}

39
function unique2 (array) {
40
  var res = []
41
  var sortedArray = array.concat().sort()
42
  var seen
43
  for (var i = 0, len = sortedArray.length; i < len; i++) {
44
    // 如果是第一个元素或者相邻的元素不相同
45
    if (!i || seen !== sortedArray[i]) {
46
      res.push(sortedArray[i])
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    }
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    seen = sortedArray[i]
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  }
50
  return res
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}