Is singleton thread safe swift?
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How can we make a property optional in swift?
Consider the following code: var defaults = NSUserDefaults.standardUserDefaults() var userPref = defaults.stringForKey("userPref")! printString(userPref) func printString(string: String) { println(string) } Where is the bug? What does this bug cause? What’s the proper way to fix it?
What is a guard statement?
What is clean swift architecture?
How do you implement delegates in swift?
Is swift object oriented programming?
What is an argument in swift?
How does closure work in swift?
Why is inheritance not desirable in swift?
What is difference between weak and strong in swift?
Why swift is safe?
What do you mean by a deinitializer?