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iOS

Posted by Wilztan Andrew
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Wilztan Andrew
Python Web Development Techdegree Student 4,979 Points

swift question ! n ?

anyone know wht is the meaning of displayLabel.text! ! mean what? and var didUserPressedOperation:Bool? ? mean

1 Answer

Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

This is about optionals and unwrapping them. It's an important concept in Swift, it's impossible to cover it here, so I would recommend you have a look at the following resources:

Also, I would recommend to follow the iOS tracks on Treehouse, they are designed to learn Swift from scratch.

Wilztan Andrew
.a{fill-rule:evenodd;}techdegree
Wilztan Andrew
Python Web Development Techdegree Student 4,979 Points

hmm, can you tell me what is the main difference between array:[String] = [] and array:[String} = String

isn't both for creating empty array ?

Wilztan Andrew
.a{fill-rule:evenodd;}techdegree
Wilztan Andrew
Python Web Development Techdegree Student 4,979 Points

hmm, can you tell me what is the main difference between array:[String] = [] and array:[String} = String

isn't both for creating empty array ?