Like NSString, NSArray is another class that Objective-C programmers use a lot. An instance of NSArray holds a list of pointers to other objects. For example, let’s say you want to make a list of three NSDate objects and then go through the list and print each date.

Create a new project : a Foundation Command Line Tool called DateList. Open main.m and change the main() function:

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    @autoreleasepool {

        // Create three NSDate objects
        NSDate *now = [NSDate date];
        NSDate *tomorrow = [now dateByAddingTimeInterval:24.0 * 60.0 * 60.0];
        NSDate *yesterday = [now dateByAddingTimeInterval:-24.0 * 60.0 * 60.0];

        // Create an array containing all three (nil terminates the list)
        NSArray *dateList = [NSArray arrayWithObjects:now, tomorrow, yesterday, nil];

        // How many dates are there?
        NSLog(@"There are %lu dates", [dateList count]);

        // Print a couple
        NSLog(@"The first date is %@", [dateList objectAtIndex:0]);
        NSLog(@"The third date is %@", [dateList objectAtIndex:2]);

    }
    return 0;
}