JS数组去重的十种方法

一、前言：

我们在实际工作中，或者在面试找工作时，都会用到或者被问到一个问题，那就是“数组如何去重”。是的，这个问题有很多种解决方案，看看下面的十种方式吧！

二、数组去重方式大汇总：

Methods 1: 思路：定义一个新数组，并存放原数组的第一个元素，然后将元素组一一和新数组的元素对比，若不同则存放在新数组中。

		function unique(arr){
			var res = [arr[0]];
			for(var i=1; i<arr.length; i++){
				var repeat = false;
				for(var j=0; j<res.length; j++){
					if(arr[i] === res[j]){
						repeat = true;
						break;
					}
				}

				if(!repeat){
					res.push(arr[i]);
				}
			}
			return res;
		}
		console.log('------------方法一---------------');
		console.log(unique([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 2: 思路：先将原数组排序，在与相邻的进行比较，如果不同则存入新数组。

		function unique2(arr){
			var arr2 = arr.sort();
			var res = [arr2[0]];
			for(var i=1; i<arr2.length; i++){
				if(arr2[i] !== res[res.length-1]){
					res.push(arr2[i]);
				}
			}

			return res;
		}
		console.log('------------方法二---------------');
		console.log(unique2([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 3: 利用对象属性存在的特性，如果没有该属性则存入新数组。

		function unique3(arr){
			var res = [];
			var obj = {};
			for(var i=0; i<arr.length; i++){
				if( !obj[arr[i]] ){
					obj[arr[i]] = 1;
					res.push(arr[i]);
				}
			}

			return res;
		}
		console.log('------------方法三---------------');
		console.log(unique3([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 4: 利用数组的indexOf下标属性来查询。

		function unique4(arr){
			var res = [];
			for(var i=0; i<arr.length; i++){
				if(res.indexOf(arr[i]) == -1){
					res.push(arr[i]);
				}
			}

			return res;
		}
		console.log('------------方法四---------------');
		console.log(unique4([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 5: 利用数组原型对象上的includes方法。

		function unique5(arr){
			var res = [];

			for(var i=0; i<arr.length; i++){
				if( !res.includes(arr[i]) ){ // 如果res新数组包含当前循环item
					res.push(arr[i]);
				}
			}

			return res;
		}
		console.log('------------方法五---------------');
		console.log(unique5([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 6: 利用数组原型对象上的 filter 和 includes方法。

		function unique6(arr){
			var res = [];

			res = arr.filter(function(item){
			  return res.includes(item) ? '' : res.push(item);
			});

			return res;
		}
		console.log('------------方法六---------------');
		console.log(unique6([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 7: 利用数组原型对象上的 forEach 和 includes方法。

		function unique7(arr){
			var res = [];

			arr.forEach(function(item){
			  res.includes(item) ? '' : res.push(item);
			});

			return res;
		}
		console.log('------------方法七---------------');
		console.log(unique7([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 8: 利用数组原型对象上的 splice 方法。

		function unique8(arr){
			var i,
				j,
				len = arr.length;

			for(i = 0; i < len; i++){
		        for(j = i + 1; j < len; j++){
		            if(arr[i] == arr[j]){
		                arr.splice(j,1);
		                len--;
		                j--;
		            }
		        }
		    }

			return arr;
		}
		console.log('------------方法八---------------');
		console.log(unique8([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 9: 利用数组原型对象上的 lastIndexOf 方法。

		function unique9(arr){
			var res = [];

			for(var i=0; i<arr.length; i++){
				res.lastIndexOf(arr[i]) !== -1 ? '' : res.push(arr[i]);
			}

			return res;
		}
		console.log('------------方法九---------------');
		console.log(unique9([1,1,2,3,5,3,1,5,6,7,4]));
	

Methods 10: 利用 ES6的set 方法。

		function unique10(arr){
			//Set数据结构，它类似于数组，其成员的值都是唯一的
			return Array.from(new Set(arr)); // 利用Array.from将Set结构转换成数组
		}
		console.log('------------方法十---------------');
		console.log(unique10([1,1,2,3,5,3,1,5,6,7,4]));
	

三、其他：

有意思的是，当我把数组的长度变得很大的时候（如下所示），测试了一下不同方法的执行时间长短，会发现方法三、四、五、六、七相对来说会更有优势，而方法八的执行速度似乎一直垫底。你也可以在你本地跑一下试试！

	//测试用的超大数组
	var arr = 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	//这里只是举例方法三（如果你把所有方法放在一起测试，会更直观的看到执行时间的差异）
	var time3 = new Date().getTime();
	function unique3(arr){
		var res = [];
		var obj = {};
		for(var i=0; i<arr.length; i++){
			if( !obj[arr[i]] ){
				obj[arr[i]] = 1;
				res.push(arr[i]);
			}
		}

		return res;
	}
	console.log('------------方法三---------------');
	console.log( unique3(arr) );
	console.log('3所花时间： ' + (new Date().getTime() - time3));