NSMutableArray在多个索引处初始化

Question

Trying to create an array to store data about a deck of cards. I'm wanting to keep a boolean for each card.

I want to create an array of capacity 52 with each index initialized to NO (or 0). Is there a way to do this all in one go instead of

[[NSArray alloc] initWithObjects: 0, 0, 0, .... nil];

Answer 1

Either put all 52 instances of @NO as parameters to initWithObject: or create it as an NSMutableArray and use a loop to add 52 objects.

NSMutableArray *array = [NSMutableArray arrayWithCapacity:52];
for (int i = 0; i < 52; i++) {
    [array addObject:@NO];
}

BTW - passing a set of 0 to initWithObjects: won't work at all. Either use @NO for the BOOL value of NO or use @0 for the number 0 (wrapped as an NSNumber ). Just using 0 is the same as nil so no objects will be added.

Answer 2

Use a loop

NSMutableArray *deck = [NSMutableArray array];

for(NSInteger i = 0; i < 52; i++)
{
    [deck addObject:[NSNumber numberWithInteger:0]];
}