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Mastering Swift 4 - Fourth Edition by Jon Hoffman

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Functions and methods

Function names should be descriptive, describing the function or method. They should be in CamelCase. Here are some examples of proper and non-proper names:

//Proper Naming Convention getCityName 
playSound 
 
//Non-Proper Naming Convention 
get_city_name  //All lowercase and has an underscore  
PlaySound  //Begins with an upper case letter 

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