How do I extract the common elements from an array and put them into two arrays?

var arr = ["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"];

The last three digits of each element in

arr are different. I want to intercept the first ten digits of each element into an array and put different ones into another array

Es6 javascript-array javascript
Mar.04,2021 
const arr = ["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"];
const prefix = '2018-04-17';  // 
const samePrefix = []; // 
const others = []; // 
arr.forEach(date=>{
    if (date.substring(0,10) === prefix) {
        samePrefix.push(date)
    } else {
        others.push(date);
    }
})
var arr = ["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"];
    const result=arr.reduce((obj,item)=>{
        const key=item.substring(0,10);
        if(!obj[key]){
            obj[key]=[];
        }
        obj[key].push(item);
        return obj;
    },{});
    const _result=Object.keys(result).map(key=>result[key]);
    console.log(_result);

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e932cf-1436.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e932cf-1436.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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