[...arr1,...arr2].reduce((result,v)=>{
letindex=result.diff.indexOf(v)
if(index!==-1){
result.same.push(result.diff.splice(index,1)[0]);
}else{
result.diff.push(v);
}
returnresult;
},{same:[],diff:[]})
                            

consta=[1,2,3,4];
constb=[2,3,5,6];
functionfilterArr(arr1,arr2,type){
letdiffArr=[];
letsameArr=[];
sameArr=arr1.filter(v=>{
returnarr2.some(a=>{
returnv==a
})
})
letmergeArr=[...arr1,...arr2];
diffArr=mergeArr.filter(v=>{
return!sameArr.includes(v)
})
if(type=='same'){
returnsameArr
}else{
returndiffArr
}
}
console.log(filterArr(a,b,'same'))//[2,3]
console.log(filterArr(a,b,'diff'))//[1,4,5,6]