CODEWITHSUNDEEP
iosobjective-carrays
serhat sezer
serhat sezer

Reputation: 1334

Dictionary key-value using with array

I have an array and it has lots of dictionary's keys it comes from API. My array as follows

Dictionary keys array :

NSArray *arr = @[@"01", @"02", @"03"];

Dictionary with key-value pairs

NSDictionary *dic = @{@"01": @"Hero", @"02" : @"Enemy", @"03" : @"Boss"};

Basically i want to match array values corresponding to dictonary keys without using array. I found a solition about that but I don't want to use for-loop for every cell(I have a lots of cell). My solution is like that 

for(NSString *item in arr) {
        [convertedArr addObject:[dic valueForKey:item]];
    }

    NSLog(@"%@", [convertedArr componentsJoinedByString:@","]);

Asumme have an array like this (1,2,3) and dictionary looks like {1 = "a", 2 = "b", 3 = "c"} I just want to give an array and it should return dictionary values like this ("a","b","c")

Anybody should give me better approach without using array? Thanks.

Upvotes: 0

Views: 358

Answers (1)

Martin R
Martin R

Reputation: 539685

You can replace your for-loop by

NSArray *convertedArr = [dic objectsForKeys:arr notFoundMarker:@""];

which is at least less code. (The notFoundMarker: is added for all keys in the array which are not present in the dictionary. Your code would crash in that situation.)

It might perform slightly better because it is a library function. But I doubt that the difference is big, because in any case a dictionary loopup is required for all keys in arr.

Upvotes: 1

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