Getting Array with values from an array of NSDictionary

Question

I have an array with 4 Dictionaries with key @"preference" like as follows

 (
        {
          preference = Nose;
        },

        {
          preference = "Heart rate";
        },

        {
          preference = Glucose;
        },

        {
          preference = Food;
        }
)

Now i want to retrieve an array for these dictionary values like"

 (
    Nose, Heart rate,  Glucose,  Food
 )

How s'd i get it.. Thanks in advance

albertamg · Accepted Answer · 2012-03-02 12:28:03Z

24

A one-liner:

NSArray *resultingArray = [arrayOfDictionaries valueForKeyPath:@"preference"];

answered Mar 2, 2012 at 12:28

albertamg

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1 Comment

JeremyP Over a year ago

You might get marginally better performance in this case by using -valueForKey:

InsertWittyName · Accepted Answer · 2012-03-03 05:32:49Z

9

Try it:

NSArray *result = [dictionaryObject valueForKeyPath:@"preference"];

It'll solve your Problem

edited Mar 3, 2012 at 5:32

InsertWittyName

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answered Mar 2, 2012 at 12:32

Ankit Gupta

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Comments

Robin Summerhill · Accepted Answer · 2012-03-02 12:23:53Z

2

Do something like this:

NSMutableArray *collectedValues = [NSMutableArray arrayWithCapacity:array.count];

for (NSDictionary *dict in array) {
    NSString *value = [dict objectForKey:@"preference"];
    if (value) {
        [collectedValues addObject:value];
    }
}

answered Mar 2, 2012 at 12:23

Robin Summerhill

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Comments

Antonio MG · Accepted Answer · 2012-03-02 12:26:40Z

2

Try with this code:
myArray is your first array mySecondArray is the array you have in the end

 NSMutableArray *mySecondArray = [[NSMutableArray alloc] init];

        for (int i = 0; i < [myArray count] ; i++)
        {
            NSDictionary *tempDict = [myArray objectForIndex:i];
            [mySecondArray addObject:[tempDict objectForKey@"preference"]];


        }

answered Mar 2, 2012 at 12:26

Antonio MG

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