一.数组

1.数组去重

1）Reduce API

let arr = [1,2,2,2,3,4,4,5]
    arr = arr.reduce((r, c) => {
      return {
        ...r,
         [c]: c
         }
    }, {})
let result = Object.values(arr)
console.log(result)

// [1,2,3,4,5]