数组去重的三种方法

1 function dedupe(array){
2     return Array.from(new Set(array));
3 }
4 ?
5 dedupe([1,2,3,3])

 1 let list = [1,2,4,3,2,3,5,6,7,8,7];
 2 ?
 3 let result = list.sort().reduce((init,current) => {
 4     if(init.length === 0 || init[init.length-1] !== current){
 5         init.push(current);
 6     }
 7     return init;
 8 },[]);
 9 ?
10 console.log(result);

1 let arr = [1,2,3,3,4,5,5];
2 let unique = [...new Set(arr)];
3 return unique
4 //[1,2,3,4,5]