ios - can i add key value pair to NSarray or dictionary inside a for loop? -

i want add values nsmutabledictionary loop key value pairs ?

currently using code

for(int j=0;j<[array count];j++){     for(int l=0;l<array2 count] ;l++){              // retreive category plist ,then check whether matching "catid"           nsstring *temp=[nsstring stringwithformat:@"%@",allbookplist[@"listbook"][j][@"cate"][l][@"categories"]];             if([catid isequaltostring:temp]){                      // "catid" matching temp ,retreive corresponding bid plist                  nsstring *str=[nsstring stringwithformat:@"%@",allbookplist[@"listbook"][j][@"bid"]];                  // add  value "bid" , key "catid" mutabledictionary                  nsmutabledictionary *m=[[nsmutabledictionary alloc]init];                  [m setvalue:str forkey:catid];             }      } } 

the result each time value of final dictionary "m" replaced latest values,but want values toghether?

iam trying output this

i suppose can move initialization of dictionary outside of for, because in got initialised in every loop , that's why got 1 value

nsmutabledictionary *m = [[nsmutabledictionary alloc] init]; for(int j=0; j < [array count]; j++) {     nsmutablearray *containerarray = [[nsmutablearray alloc] init];     for(int l=0;l<[array2 count] ;l++)     {         // retreive category plist ,then check whether matching "catid"         nsstring *temp=[nsstring stringwithformat:@"%@",allbookplist[@"listbook"][j][@"cate"][l][@"categories"]];          if([catid isequaltostring:temp])         {             // "catid" matching temp ,retreive corresponding bid plist             nsstring *str=[nsstring stringwithformat:@"%@",allbookplist[@"listbook"][j][@"bid"]];              // add  value "bid" , key "catid" mutabledictionary              [containerarray addobject:str];         }         [m setvalue:containerarray forkey:catid];     } } 

update

i have updated code above in order adapt output in picture