Shulou(Shulou.com)06/01 Report--

This article is about sample analysis of set in ES6. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

set

New data structure Set, which is similar to array, the values of the members are unique, the collection implements the iterator interface, so you can use the extension operator and for of traversal

Collection properties and methods

1 size Returns the number of elements in the collection

2 add adds a new element and returns to the current collection

3 delete Delete element, return boolean value

4 has Detects whether a collection contains an element and returns boolean

5 clear Clear

//Statement let s = new Set(); let s2 = new Set([1, 2, 3, 6, 7]); console.log(s2);// 5 s2.add(8);//add new element console.log(s2);//Output {1, 2, 3, 6, 7, 8} s2.delete(8); console.log(s2);//Output {1, 2, 3, 6, 7} console.log(s2.has(8));// false //clear ();//clear let arr = [1, 2, 3, 3, 3, 6, 6, 8]; let arr2 = [1, 3, 6, 7, 8]; //array de-duplication let result = [... new Set(arr)]; //intersection let result = [... new Set(arr)].filter(item => new Set(arr2).has(item)); //union let result = [... new Set([... arr, ... arr2])]; //difference set arr has arr2 has none let result = [... new Set(arr)].filter(item => ! (new Set(arr2).has(item)); Thank you for reading! About "ES6 set sample analysis" This article is shared here, I hope the above content can be of some help to everyone, so that everyone can learn more knowledge, if you think the article is good, you can share it to let more people see it!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.