What is Swift Messages?

Swift Messages is a library in iOS which used for displaying brief messages in the form of a status bar across the top or bottom of the screen.

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In Swift, Optionals and Optional Binding are key concepts for handling values ?

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What is benifit of using higher order functions?

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Swift Optionals and force unwrapping?

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The  Swift programming language  supports optional types, which handle the absence of a value. An optional represents two possibilities: Either there is a value and you can unwrap the optional to access that value, or there isn't a value at all. Here is how you can declare an optional variable in Swift: var myOptionalString: String ? The  myOptionalString  variable can contain a string value or nil. If the optional has a value, you can access the underlying value by explicitly unwrapping it using the exclamation mark operator like: print ( "Underlying value of myOptionalString: \(myOptionalString!)." ) Dangers of force unwrapping Although force unwrapping looks convenient, it is extremely dangerous to use: if the optional has no value and you try to unwrap it, this will trigger a runtime error - generally causing the app to crash. The majority of crashes I have seen in Swift code have been caused by an incorrect explicit unwrap. Why would someone unwrap a nil option...
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