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Why are Swift optionals better than the way Objective-C handles nil? Suppose you have an Employee and a Department object, and they retain each other strongly. Is this a problem? If so, how do you fix it? Explain the concept of delegation: problems it's addressing, how it works, benefits. How many different ways do you know to lay out a UIView? What is a race condition? What constructs do we have to prevent them in iOS?
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IOS Developer

Interviewed at PIX System

2.8★
Nov 8, 2019

Why are Swift optionals better than the way Objective-C handles nil? Suppose you have an Employee and a Department object, and they retain each other strongly. Is this a problem? If so, how do you fix it? Explain the concept of delegation: problems it's addressing, how it works, benefits. How many different ways do you know to lay out a UIView? What is a race condition? What constructs do we have to prevent them in iOS?

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