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【Swift 60秒】37 - Writing functions


0x00 Lesson

Functions let us ​​re-use​​ code, which means we can write a function to do something interesting then run that function from lots of places. Repeating code is generally a bad idea, and functions help us avoid doing that.

To start with, we’re going to write a function that prints help information for users of our app. We might need this anywhere in our app, so having it as a function is a good idea.

Swift functions start with the ​​func​​ keyword, then your function name, then open and close parentheses. All the body of your function - the code that should be run when the function is requested - is placed inside braces.

Let’s write the ​​printHelp()​​ function now:

func printHelp(){
let message = """
Welcome to MyApp!
Run this app inside a directory of
images and
MyApp will resize them all into
thumbnails
"""
print (message)
}

We can now run that using ​​printHelp()​​ by itself:

printHelp()

Running a function is often referred to as calling a function.

0x01 我的小作品

欢迎体验我的作品之一:​​小编辑器-XCompiler​​​ 在线编辑器~小而巧
​App Store​​ 搜索即可~


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