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I can't figure out why variable number is not being assigned to array self.items. In the debugger it is showing value of NULL.

-(void)pushItem:(double)number{
    [self.items addObject:[[NSNumber alloc]initWithDouble:number]];

    if (self.items.lastObject == 0)
    {
        // ** need to add variable number to self.items array**
       
    }
}
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    You probably never initialized your items property. Also, your if check isn't doing what you probably think it is trying to do. The only way that will ever be true is if self.items is nil or if there are no objects in the array. Commented Sep 28, 2023 at 1:11
  • FYI - Easier syntax: [self.items addObject:@(number)];. Commented Sep 28, 2023 at 1:11
  • Did you initialize self.items? Self.items = [NSMutableArray new]; Additionally if you want to check for a number value you should call doubleValue or integerValue on the stored object Commented Sep 28, 2023 at 5:11
  • Is self.items nil? self.items.lastObject == 0 doesn't seems to be the correct way too. Did you meant if ([self.items.lastObject equalsTo:@(0.0)]) or if (self.items.lastObject == nil)? ... ? Commented Sep 28, 2023 at 7:55
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