Android Question Optional parameters?

[CesarLM]

B4A Version 5.80 you cannot set optional parameters?

 

[DonManfred]

Optional parameters for WHAT?

 

[Widget]

Optional parameters for WHAT?

I think he means Subs cannot have optional parameters.

In Delphi procedures you can have default values for parameters.

The way it would look in B4A is:

'All 3 parameters have default values and are optional
sub SumAll(Value1=0 as int, Value2=0 as int, Value3=0 as int) as Int
return Value1 + Value2 + Value3
end sub

'If a parameter has a default value, the argument is optional in the calling rtn.
'It can be called using:
x = SumAll()
x = SumAll(123)
x = SumAll(123,456)
x = SumAll(123,456,789)

Optional parameters can only appear after required parameters.
So the following is legal:

'The first parameter is NOT optional so you must call SumAll with at least one argument:
sub SumAll(Value1 as int, Value2=0 as int, Value3=0 as int) as Int
return Value1 + Value2 + Value3
end sub

'In the calling rtn:
x = SumAll() 'This gives syntax error because Value1 parameter is not optional because it does not have a default value.
x = SumAll(123) 'This works
x = SumAll(123,456) 'This works
x = SumAll(123,456,789) 'This works

I would love to see this in B4X.
I use it all the time in Delphi.

 

[DonManfred]

I think he means Subs cannot have optional parameters.

In Delphi procedures you can have default values for parameters.

I see. If the TO would have described it more clearly i dont need to ask for it.

 

[CesarLM]

I see. If the TO would have described it more clearly i dont need to ask for it.

Thank you Widjet! I understand Inglês , but i can not write fluently.

 

[Widget]

I have created this as a Wish if anyone wants to vote on it.

https://www.b4x.com/android/forum/threads/i-would-like-to-have-optional-parameters-for-subs.68996/