如何提取数组中的公共元素分别放到两个数组？

Question

vararr=["2018-04-17T03","2018-04-18T15","2018-04-17T04","2018-04-18T16","2018-04-17T05","2018-04-18T17","2018-04-17T06","2018-04-17T07","2018-04-17T08","2018-04-17T09","2018-04-17T20","2018-04-18T10","2018-04-17T21","2018-04-18T11","2018-04-17T00","2018-04-17T22","2018-04-18T12","2018-04-17T01","2018-04-17T23","2018-04-18T13","2018-04-17T02","2018-04-18T14","2018-04-17T14","2018-04-18T04","2018-04-17T15","2018-04-18T05","2018-04-17T16","2018-04-18T06","2018-04-17T17","2018-04-18T07","2018-04-17T18","2018-04-18T08","2018-04-17T19","2018-04-18T09","2018-04-17T10","2018-04-18T00","2018-04-17T11","2018-04-18T01","2018-04-17T12","2018-04-18T02","2018-04-17T13","2018-04-18T03"];arr中的每一个元素后三位不同，我想将每个元素前面十位相同的截取到一个数组，不同的放到另一个数组

Answer 1

constarr=["2018-04-17T03","2018-04-18T15","2018-04-17T04","2018-04-18T16","2018-04-17T05","2018-04-18T17","2018-04-17T06","2018-04-17T07","2018-04-17T08","2018-04-17T09","2018-04-17T20","2018-04-18T10","2018-04-17T21","2018-04-18T11","2018-04-17T00","2018-04-17T22","2018-04-18T12","2018-04-17T01","2018-04-17T23","2018-04-18T13","2018-04-17T02","2018-04-18T14","2018-04-17T14","2018-04-18T04","2018-04-17T15","2018-04-18T05","2018-04-17T16","2018-04-18T06","2018-04-17T17","2018-04-18T07","2018-04-17T18","2018-04-18T08","2018-04-17T19","2018-04-18T09","2018-04-17T10","2018-04-18T00","2018-04-17T11","2018-04-18T01","2018-04-17T12","2018-04-18T02","2018-04-17T13","2018-04-18T03"];
constprefix='2018-04-17';//这个是相通的前缀，可以换
constsamePrefix=[];//存放相同前缀的数组
constothers=[];//存放不同前缀的数组
arr.forEach(date=>{
if(date.substring(0,10)===prefix){
samePrefix.push(date)
}else{
others.push(date);
}
})
                            

Answer 2

vararr=["2018-04-17T03","2018-04-18T15","2018-04-17T04","2018-04-18T16","2018-04-17T05","2018-04-18T17","2018-04-17T06","2018-04-17T07","2018-04-17T08","2018-04-17T09","2018-04-17T20","2018-04-18T10","2018-04-17T21","2018-04-18T11","2018-04-17T00","2018-04-17T22","2018-04-18T12","2018-04-17T01","2018-04-17T23","2018-04-18T13","2018-04-17T02","2018-04-18T14","2018-04-17T14","2018-04-18T04","2018-04-17T15","2018-04-18T05","2018-04-17T16","2018-04-18T06","2018-04-17T17","2018-04-18T07","2018-04-17T18","2018-04-18T08","2018-04-17T19","2018-04-18T09","2018-04-17T10","2018-04-18T00","2018-04-17T11","2018-04-18T01","2018-04-17T12","2018-04-18T02","2018-04-17T13","2018-04-18T03"];
constresult=arr.reduce((obj,item)=>{
constkey=item.substring(0,10);
if(!obj[key]){
obj[key]=[];
}
obj[key].push(item);
returnobj;
},{});
const_result=Object.keys(result).map(key=>result[key]);
console.log(_result);