What are the methods of array deduplication in JavaScript
Editor to share with you what are the methods to achieve array de-duplication in JavaScript. I hope you will get something after reading this article. Let's discuss it together.
Array deduplication const arr = [1, 1,'1, 17, true, true, false, false, 'true',' a circle, {}, {}]; / / > [1,'1, 17, true, false, 'true',' a weight, {}, {}] method 1: using Setconst res1 = Array.from (new Set (arr)); method 2: two-layer for loop + spliceconst unique1 = arr = > {let len = arr.length; for (let I = 0) I
< len; i++) { for (let j = i + 1; j < len; j++) { if (arr[i] === arr[j]) { arr.splice(j, 1); // 每删除一个树，j--保证j的值经过自加后不变。同时，len--，减少循环次数提升性能 len--; j--; } } } return arr;}方法三：利用indexOfconst unique2 = arr =>{const res = []; for (let I = 0; I
< arr.length; i++) { if (res.indexOf(arr[i]) === -1) res.push(arr[i]); } return res;}方法四：利用includeconst unique3 = arr =>{const res = []; for (let I = 0; I
< arr.length; i++) { if (!res.includes(arr[i])) res.push(arr[i]); } return res;}方法五：利用filterconst unique4 = arr =>{return arr.filter ((item, index) = > {return arr.indexOf (item) = index;});} method 6: use Mapconst unique5 = arr = > {const map = new Map (); const res = []; for (let I = 0; I < arr.length; iTunes +) {if (! map.has (arr [I])) {map.set (arr [I], true) res.push (ARR [I]);} return res } after reading this article, I believe you have a certain understanding of "what are the methods to achieve array de-duplication in JavaScript". If you want to know more about it, welcome to follow the industry information channel, thank you for reading!
