5 examples of 'javascript unique array of objects' in JavaScript

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

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

19
function unique(array) {
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	var n = -1;
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	while (++n < array.length) {
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		remove(array, array[n], n);
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	}
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	return array;
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}

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));
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}

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function arrayUnique(array) {
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	const a = array.concat();
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	for (let i = 0; i < a.length; ++i) {
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		for (let j = i + 1; j < a.length; ++j) {
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			if (a[i] === a[j]) {
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				a.splice(j--, 1);
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			}
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		}
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	}
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	return a;
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}