Global variables:

 

Set( globVar, Blank()); // default any value

 

If(isVal, Set(isVal, false), Set(isVal,true))

better

Set(isVal, !isVal)

Set( RunningTotal, RunningTotal + TextInput1 ) // initialize and set

Set( RunningTotal, 0 ) // reset

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Context Variables (Local Variables)

UpdateContext( { locVar1: 0 , locVar2: 0 , } )

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Pass Variables to next Screen

Navigate(Screen2, ScreenTransition.Cover,{newVar: locVar})

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Preset the value of an input box

1. set a global variable on app or screen visible:
   Set(varCurrencyVal, Blank());
2. on Curr1_val textbox Default:
   If(IsBlank(varCurrencyVal),Parent.Default,varCurrencyVal)
3. OnSave
   If(
   IsBlank(Curr1_val.Text),
   Set(varCurrencyVal, 0);
   SubmitForm(EditForm1)
   )

to reset:
Reset(TextInput1)

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Preset the values for a dropdown

[“”,”Red”,”Blue”]