You can think in app functions like a good way to reuse pieces of scripts code. You can define whatever number of functions in your apps, everyone with their appropiate arguments, if you need it. App Builder recognize the functions you created and put it into the actions tool bar, in order to be used in the same way than the actions included by App Builder.
When you create a function, you need to provide a function name, a function description (optional but recommended) and the optional function arguments. App Builder take care about these function definitions and present your the appropiate function's editor when you choose a function from the actions tool bar or when you double clic a function in a script code editor.
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