Learning Swift from scratch (Day1)--My first line of Swift code

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when I first saw the following code, I petrified, what is the code? The words spelled out?  

Import Foundation           

var str = "HelloWorld"        

print (str)          

Dizzy, okay, keep your head down and look down, oh, yes.

The first sentence: Import Foundation

represents the introduction Foundation Framework.

What is Foundation framework?

Foundation is a OS X and the IOS the underlying framework for application development, which includes basic classes such as numbers, strings, arrays, dictionaries, and so on.

Cocoa Framework is OS X the development requires several frameworks which include: AppKit and the Foundation Framework. the UIKit Framework is a Framework for developing IOS graphical user interfaces, including common views and view controllers.

The second sentence: var str = "Hello World"

Statement Str variables, var represents a declared variable.

The third sentence: print (str)

Print (_:) is a function that can output variables or constants to the console.

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Learn Swift from scratch (Day1)-My first line of Swift code