JS实现数组去重常用的六种方法

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【面试题】JS实现数组去重常用的六种方法_哔哩哔哩_bilibili

双重for循环去重

let arr = [1,2,3,4,3,2,3,5];let unique = (arr)=>{//第一层for循环 数组的前一项for(var i=0; i<arr.length; i++){//第二层for循环 数组后一项for(var j=i+1; j<arr.length; j++){if(arr[i] === arr[j]){arr.splice(j,1);//删除反复元素j--;//修改下标}}}return arr;}unique(arr);console.log(arr);

let arr = [1,3,5,3,5]let newArr = [];let unique = (arr)=>{let newArr = [];//新数组，用来接管不反复的数组for(var i=0; i<arr.length; i++){if(! newArr.includes(arr[i])){newArr.push(arr[i]);}}return newArr;}console.log(unique(arr));

let arr = [1,3,4,5,3,4,5,32,4];let newArr = [];let unique = (arr)=>{let newArr = [];//新数组，用来接管不反复的元素for(var i=0; i<arr.length; i++){if(newArr.indexOf(arr[i])===-1){newArr.push(arr[i]);}}rerurn newArr;}console.log(unique(arr));

let arr = [12,43,23,43,68,12];let item = [...new Set(arr)];console.log(item);//[12, 43, 23, 68]

console.log(Array.from(new Set(arr))) ;console.log([...new Set(arr)]) ;

let index = 0arr = arr.sort()function loop(index){if(index > 1){if(arr[index] == arr[index - 1]){arr.splice(index,1)}index--loop(index)}}loop(arr.length - 1)console.log(arr);

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【面试题】JS实现数组去重常用的六种方法_哔哩哔哩_bilibili