how to use nsarray

nsarray.m

#import <Foundation/Foundation.h>

@interface Person : NSObject

@property (nonatomic, strong) NSString    *name;

+ (id)personWithName:(NSString *)name;
- (id)initWithName:(NSString *)name;

- (void)hello;

@end

@implementation Person

@synthesize name = _name;

+ (id)personWithName:(NSString *)name
{
    return [[Person alloc] initWithName:name];
}

- (id)initWithName:(NSString *)name
{
    if (self = [super init]) {
        self.name = name;
    }
    
    return self;
}

- (void)hello
{
    NSLog(@"%@ says hello", self.name);
}

@end

int main(int argc, const char * argv[])
{
    
    @autoreleasepool {
        
        NSArray *array = [NSArray arrayWithObjects:[Person personWithName:@"Bob"], 
                          [Person personWithName:@"John"], nil];
        
        {
            // Solution one : classic for loop
            for (NSUInteger index = 0; index < [array count]; ++index) {
                Person *p = [array objectAtIndex:index];
                [p hello];
            }
        }
        
        {
            // Solution two : forin loop
            for (Person *p in array) {
                [p hello];
            }
        }
        
        {
            // Solution three : enumeration with block
            [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                Person *p = obj;
                [p hello];
            }];
        }
        
        {
            // Solution three bis (be causious while changing the type! it's not safe)
            [array enumerateObjectsUsingBlock:^(Person *p, NSUInteger idx, BOOL *stop) {
                [p hello];
            }];
        }
        
        {
            // Solution four : NSEnumerator
            NSEnumerator *enumerator = [array objectEnumerator];
            Person *p = nil;
            while (p = [enumerator nextObject]) {
                [p hello];
            }
        }
    }
    
    return 0;
}

this is comment test

Test

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