Building up an array an element at a time

Question

Currently I'm populating an array in one line, e.g.

self.monthMonths = [[NSArray alloc] initWithObjects:@"January", @"February", @"March", @"April", @"May", @"June",@"July",@"August",@"September",@"October",@"November",@"December", nil];

What is the syntax to add these elements one at a time as I want to pull the data from a database. I'm using the months of the year as an example.

while([results next]) {
    NSString *months = [results stringForColumn:@"month"];
    self.month = [[NSArray alloc] initWithObjects:@"month",nil];
    //[NSArray 
    NSLog(@"Month: %@",month);
}

addObject: stackoverflow.com/questions/3698152/…

Robot Woods
– Robot Woods

2012-07-05 16:39:51 +00:00
Commented Jul 5, 2012 at 16:39 — Robot Woods
– Robot Woods, Commented Jul 5, 2012 at 16:39

Abizern · Accepted Answer · 2012-07-05 16:40:43Z

2

Create an NSMutableArray and add the objects to it one by one with addObject

answered Jul 5, 2012 at 16:40

Abizern

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Nicolas Miari · Accepted Answer · 2012-07-05 16:41:17Z

1

You need to use NSMutableArray instead, and call -addObject:

answered Jul 5, 2012 at 16:41

Nicolas Miari

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2 Comments

Edward Hasted Over a year ago

Cheers - message understood. Out of interest what is the difference in a mutable array of the two setup types: NSMutableArray *monthly = [NSMutableArray arrayWithCapacity:12]; or NSMutableArray *monthly = [[NSMutableArray alloc] init];

Nicolas Miari Over a year ago

If I remember correctly, -initWithCapacity: makes room for the declared amount of items from the start. It should be slightly better performance-wise if you know how many elements you will add, but I've never tested it. Once you start "exceeding the initial bounds" by adding excess objects, the array resizes itself on the fly. Just using -init and adding elements on demand is OK too.

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