Implement the m file
@protocol Stack &lt;NSObject&gt;

@property (nonatomic, readonly) NSInteger count;

- (void)pushObject:(nonnull id)object;
- (nullable id)popObject;

@end

Question

Implement the m file
@protocol Stack &amp;lt;NSObject&amp;gt;

@property (nonatomic, readonly) NSInteger count;

- (void)pushObject:(nonnull id)object;
- (nullable id)popObject;

@end

Sigiloso · Accepted Answer

@interface Stack ()
NSMutuableArray * stackArr;
@end

@implementation Stack ()

-(id) init
{
    stackArr = [[NSMutuableArray alloc] init];
    _count = 0;
    
    return self;
}
- (void)pushObject:(nonnull id)object
{
    [stackArr addObject:object];
    self.count++;
}

- (nullable id)popObject
{
    if(count == 0)
    return null;
    
    else
 {
     self.count--;
         return [stackArr objectAtIndex(self.count)];
 }
}

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