Top 100+ questions in Technology

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Q: How can we put nil it into dictionary/array?

How can we put nil it into dictionary/array?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What can’t we put into an array or dictionary?

What can’t we put into an array or dictionary?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What happens with the objects if the array is released?

What happens with the objects if the array is released?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What happens if you add your just created object to a mutable array, and you release your object?

What happens if you add your just created object to a mutable array, and you release your object?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is the isa member in Objective-C?

What is the isa member in Objective-C?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What happens when you create a block?

What happens when you create a block?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: How to make a code snippet thread safe?

How to make a code snippet thread safe?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: Reflection? Class Introspection? is there anything in objc and cocoa?

Reflection? Class Introspection? is there anything in objc and cocoa?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is a process, thread?

What is a process, thread?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is an extension in Objective-C?

What is an extension in Objective-C?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is the difference between underscore and self (i.e self.xx and _xx) ?

What is the difference between underscore and self (i.e self.xx and _xx) ?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What does @synchronized() do?

What does @synchronized() do?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is toll-free bridging and when is it useful?

What is toll-free bridging and when is it useful?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: When might you use a CFArray/Dictionary instead of a NSArray/Dictionary?

When might you use a CFArray/Dictionary instead of a NSArray/Dictionary?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What happens when we invoke a method on a nil pointer?

What happens when we invoke a method on a nil pointer?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: Is Objective C, a dynamic language? True/False, explain.

Is Objective C, a dynamic language? True/False, explain....

asked Nov 10, 2020 in Technology by JackTerrance

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Q: Does a thread created using performSelectorInBackground:withObject: creates its own autorelease pool?

Does a thread created using performSelectorInBackground:withObject: creates its own autorelease pool?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What are NSAutoreleasePool? When to use them?

What are NSAutoreleasePool? When to use them?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: How does dispatch_once manages to run only once?

How does dispatch_once manages to run only once?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: Can you write setter method for a retain property?

Can you write setter method for a retain property?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: Who calls dealloc method? Can we implement dealloc in ARC? If yes, what is the need to do that?

Who calls dealloc method? Can we implement dealloc in ARC? If yes, what is the need to do that?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: Are id and instanceType same? If not, what are differences between them in Objective-C?

Are id and instanceType same? If not, what are differences between them in Objective-C?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is instanceType in Objective-c?

What is instanceType in Objective-c?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is id in Objective-C?

What is id in Objective-C?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is responder chain in Objective-C?

What is responder chain in Objective-C?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What are blocks and how are they used?

What are blocks and how are they used?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is KVC and KVO? Give an example of using KVC to set value.

What is KVC and KVO? Give an example of using KVC to set value....

asked Nov 10, 2020 in Technology by JackTerrance

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Q: What is GCD? What are advantages over NSThread?

What is GCD? What are advantages over NSThread?...

asked Nov 10, 2020 in Technology by JackTerrance

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Q: Explain the difference between atomic and nonatomic synthesized properties.

Explain the difference between atomic and nonatomic synthesized properties....

asked Nov 10, 2020 in Technology by JackTerrance

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Q: Mention whether NSObject is a parent class or derived class?

Mention whether NSObject is a parent class or derived class?...

asked Nov 10, 2020 in Technology by JackTerrance