object array to NSMutable array [duplicate]

Question

I have an array of Objects.Object contains three values, id,name,value.I want to parse name from this object array and want to create a different array of names only....Can anyone help Plz.....

int i; 
NSInteger *namesCount=[eCategories count]; //eCategories is an object array 
SubCategories *subCategoriesList=[[SubCategories alloc] init];
//SubCategories is a NSObject class containing cat_name,cat_id,cat_value. 
NSMutableArray *nameArray=[[NSMutableArray alloc]init]; 
for(i=0;i<namesCount;i++)
{ 
    subCategoriesList=[eCategories objectAtIndex:i]; 
    nameArray=subCategoriesList.cat_name; 
}

int i; NSInteger *namesCount=[eCategories count]; SubCategories *subCategoriesList=[[SubCategories alloc] init];//NSObject class containing cat_name,cat_id,cat_value. NSMutableArray *nameArray=[[NSMutableArray alloc]init]; for(i=0;i<namesCount;i++){ subCategoriesList=[eCategories objectAtIndex:i]; nameArray=subCategoriesList.cat_name; } I am making some mistake that i knw......i am a begineer tryng to learn Objective c.This is the code.. — gopal
– gopal, Commented May 9, 2011 at 14:46
You should edit your answer rather than put the code in a comment where it is totally unreadable. I've done it for you this time :) — JeremyP
– JeremyP, Commented May 9, 2011 at 14:49

JeremyP · Accepted Answer · 2011-05-09 14:53:21Z

1

NSArray has a method -valueForKey: which does exactly what you want in one message

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

NSArray* nameArray = [eCategories valueForKey: @"cat_name"];

answered May 9, 2011 at 14:53

JeremyP

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Comments

Steven Kramer · Accepted Answer · 2011-05-09 14:44:13Z

0

How about

[objects valueForKeyPath: @"@distinctUnionOfArrays.name"]

Unless, of course, the objects inside the array are not NSDictionaries with "name" as the key for the names. You're not telling us enough.

answered May 9, 2011 at 14:44

Steven Kramer

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Comments

Deepesh · Accepted Answer · 2011-05-10 13:24:17Z

-1

int i;

NSInteger *namesCount=[eCategories count]; //eCategories is an object array

SubCategories *subCategoriesList=[[SubCategories alloc] init];

//SubCategories is a NSObject class containing cat_name,cat_id,cat_value.

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

for(i=0;i

[nameArray addobject:subCategoriesList.cat_name]; }

answered May 10, 2011 at 13:24

Deepesh

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