在es6中使用数组去重

在es6中使用数组去重

1. set

   const arr = ["a","a","b","b","c","c"];
   [...new Set(arr)]
   

2. filter

   arr.filter((item,index)=>arr.indexOf(item) === index);
   

3. reduce

   arr.reduce((curr,item)=>
    curr.includes(item)?curr:[...curr,item])