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    <p><code>isMemberOfClass:</code> will only return <code>YES</code> if the instance's class is exactly the same, however <code>isKindOfClass:</code> will return <code>YES</code> if the instance's class is the same, or a subclass of the given class.</p> <p>For example this will output <code>No!</code>:</p> <pre><code>BOOL result = [[NSMutableArray array] isMemberOfClass:[NSArray class]]; NSLog (@"%@", result? @"Yes!" : @"No!"); </code></pre> <p>But this will output <code>Yes!</code>:</p> <pre><code>BOOL result = [[NSMutableArray array] isKindOfClass:[NSArray class]]; NSLog (@"%@", result? @"Yes!" : @"No!"); </code></pre> <p>This is because an NSMutableArray is a <em>kind</em> of NSArray, but it isn't a member of the NSArray class (otherwise it wouldn't be an NSMutableArray).</p> <p>Throughout Foundation and Cocoa, there are a number of "class clusters". You can read more about this in the documentation on <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaDesignPatterns/CocoaDesignPatterns.html#//apple_ref/doc/uid/TP40002974-CH6-SW32" rel="noreferrer">Apple's developer web site</a>. Due to the nature of class clusters, if you create perhaps an <code>NSString</code> object, it may fail the <code>isMemberOfClass:[NSString class]</code> test.</p> <p>If neither <code>isKindOfClass:</code> or <code>isMemberOfClass:</code> is returning the correct value, see what class the actual object is with</p> <pre><code>NSLog(@"cat class = %@, dog class = %@", [cat className], [dog className]); </code></pre> <p>If these are returning anything other than what they are supposed to, then there is a problem with your farm class.</p>
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    1. COoutput of log is: cat class = Cat, dog class = Dog I've tried to change new with alloc and init but the result is still the same. As you can see I compare correct classes using isMemberOfClass so It should return YES as well as isKindOfClass
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