Convert Array of Dictionary in single Array

Question

This code:

server_response = [{id:1},{id:2},{id:3},{id:4}]

I am getting above response from server now I want only the list of ids in one array like

ids = [1,2,3,4];

I know we can do by for loop but it takes long time if thousand of ids inside the response array.

Is there any better way to achieve above equation?

if you want to see how to do it using loops: see this link :stackoverflow.com/questions/32414456/… — Teja Nandamuri
– Teja Nandamuri, Commented Sep 7, 2015 at 11:15

Rog · Accepted Answer · 2015-09-07 11:49:19Z

2

NSArray *result = [yourArray valueForKey:@"id"]

From the documentation for NSArray instance method valueForKey:

Returns an array containing the results of invoking valueForKey: using key on each of the array's objects

answered Sep 7, 2015 at 11:49

Rog

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Ajith Kumar · Accepted Answer · 2015-09-07 11:20:47Z

2

NSMutableArray *resultArray = [NSMutableArray array];
for (NSDictionary *dict in server_response) {

    [resultArray addObject:[dict objectForKey:@"id"]];
}

Try above code. Hope it will help you. Result array has final values

answered Sep 7, 2015 at 11:20

Ajith Kumar

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1 Comment

Bandish Dave Over a year ago

thank you but can we do without for loop becuase if a thousand of ids inside response array then complier take too much time for execution..

Sandy Patel · Accepted Answer · 2015-09-07 11:44:22Z

0

NSArray *server_response =  @[@{@"id":@"1"},@{@"id":@"2"},@{@"id":@"3"},@{@"id":@"4"}];  

    NSMutableArray *resultArray = [NSMutableArray array];

    NSString *birdtemp;
    for (NSDictionary *object in server_response) {
        birdtemp = object[@"id"];
        [resultArray addObject:birdtemp];
    }
    NSLog(@"%@",resultArray);

OutPut: [ 1, 2, 3, 4 ]

answered Sep 7, 2015 at 11:44

Sandy Patel

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