数组去重
let arr = [11, 23, 26, 23, 11, 9]
const deduplication = arr => [...new Set(arr)]
console.log(deduplication(arr)); // [ 11, 23, 26, 9 ]
保留数组中非重复数据
1 let arr = [11, 23, 26, 23, 11, 9]
2 const filterNonUnique = arr => arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i))
3
4 console.log(filterNonUnique(arr)); // [ 26, 9 ]
保留数组中重复元素
1 let arr = [11, 23, 26, 23, 11, 9]
2 const filterUnique = arr => arr.filter(i => arr.indexOf(i) !== arr.lastIndexOf(i))
3
4 console.log(filterUnique(arr)); // [ 11, 23, 23, 11 ]
原文链接 https://blog.csdn.net/momDIY/article/details/81351140
