Swift 60秒42 - Default parameters

Posted 2022-11-12

0x00 Lesson

The ​​print()​​​ function prints something to the screen, but always adds a new line to the end of whatever you printed, so that multiple calls to ​​print()​​​ ​​dont​​​ all appear on the ​​same line​​.

You can change that behavior if you want, so you could use spaces rather than line breaks. Most of the time, though, folks want new lines, so ​​print()​​​ has a ​​terminator​​ parameter that uses new line as its default value.

You can give your own parameters a default value just by writing an ​​=​​​ after its type followed by the default you want to give it. So, we could write a ​​greet()​​ function that can optionally print nice greetings:

func greet(_ person: String, nicely: Bool = true) 
  if nicely == true 
    print("Hello, \\(person)!")
   else 
    print("Oh no, its \\(person) again...")
  

That can be called in two ways:

greet("Taylor")
greet("Taylor", nicely: false)

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0x01 我的小作品

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