Wish B4X IIF Function

[MrKim]

I'm just tired of having to hunt it down to add it to every project, and then reference whatever module I put it in.

Sub IIF(ccc As Boolean, TrueVal As Object, FalseVal As Object) As Object
    If ccc Then Return TrueVal Else Return FalseVal
End Sub

 

[Alexander Stolte]

I'm just tired of having to hunt it down to add it to every project, and then reference whatever module I put it in.

i feel you.
+1

 

[Jmu5667]

+1

 

[Martin Larsen]

I need it too. Should really be part of core.

 

[DonManfred]

I need it too.

Add the sub to your project and you can use it. No need to change the core.
You can also make a small library out of it and use the newly created library in your project(s).

 

[Martin Larsen]

Sure, but you could say the same for many core routines. I find IIF so useful it should be part of core or at least a standard lib of some kind.

 

[LucaMs]

I suppose you, like all of us, use a lot of other functions that are not part of the core.

The best solution, I think, is:
https://www.b4x.com/android/forum/threads/b4x-projects-templates.119901/post-749697

(your project template will have a code module with the IIF function and other).

[I know it's not the same thing/way ]

 

[Martin Larsen]

I suppose you, like all of us, use a lot of other functions that are not part of the core.

Yes of course. But now this is a wish thread, and I can wish what I want!

It's not my wish btw, but I second it.

The best solution, I think, is:
https://www.b4x.com/android/forum/threads/b4x-projects-templates.119901/post-749697

Yes, templates are a good workaround.

 

[LucaMs]

Yes of course. But now this is a wish thread, and I can wish what I want!

I didn't write that you can't ask for what you want

Indeed, I think it is a fair request but since we all, I think, have some routines we use in every project (utility routines)...!

 

[MrKim]

I didn't write that you can't ask for what you want

Indeed, I think it is a fair request but since we all, I think, have some routines we use in every project (utility routines)...!

Yes, but this is not a favorite utility. IIF has been core to MS Basic since - Forever? - For thirty years it has been just THERE. Are there popular versions of Basic that DON'T have IIF (Besides B4X)?

 

[LucaMs]

Yes, but this is not a favorite utility. IIF has been core to MS Basic since - Forever? - For thirty years it has been just THERE. Are there popular versions of Basic that DON'T have IIF (Besides B4X)?

B4X is not VB6; in this there were also other functions that do not exist in B4X (eg InStrRev, Left, Right, Space... to mention only string functions) or have different names.

Anyway, adding IIF could be useful.

 

[Erel]

I believe that the next version of B4X IDEs will include a short circuit inline if feature.

 

[LucaMs]

I believe that the next version of B4X IDEs will include a short circuit inline if feature.

Do you mean something to change the flow conditionally?

I am seeing that there was also another function of the "same category" as IFF: Choose.

 

[Erel]

This code will work:

Label1.Text = IIf(IsNumber(EditText1.Text), EditText1.Text * 10, "Invalid number")

 

[MrKim]

B4X is not VB6; in this there were also other functions that do not exist in B4X (eg InStrRev, Left, Right, Space... to mention only string functions) or have different names.

Anyway, adding IIF could be useful.

Yes, but there are easy B4X solutions to all of those and, (I think) those are all used relatively infrequently. IIF is not. You know MS finally even added IIF to SQL server. As I understand it is simply converted to a CASE statement in the background which is ANSII compatible. But code is so much more readable with an IIF rather than a case.

 

[LucaMs]

Yes, but there are easy B4X solutions to all of those

For IIF too.

Public Sub IIF(Condition As Boolean, IfTrue As Object, IfFalse As Object) As Object
    If Condition Then Return IfTrue Else Return IfFalse
End Sub

 

[Erel]

For IIF too.

No. See the example I've posted above. It will fail with a regular method.

 

[LucaMs]

No. See the example I've posted above. It will fail with a regular method.

I had to try to make sure.

A crash occurs because IsNumber is not "computed" / evaluated and only then its result passed to the IIF function.


BTW "TextField1.Text * 10" is bad programming ?

 

[Erel]

BTW "TextField1.Text * 10" is bad programming

Not if you test it with:

Label1.Text = IIf(IsNumber(EditText1.Text), EditText1.Text * 10, "Invalid number")

 

[LucaMs]

A crash occurs because IsNumber is not "computed" / evaluated and only then its result passed to the IIF function.

and also the second calculation.

Not if you test it with:

Label1.Text = IIf(IsNumber(EditText1.Text), EditText1.Text * 10, "Invalid number")

Yes, it is anyway, because:

1 - it is better to use a variable, not a UI element (keep graphics and data/logic separate)
2 - it is better not to use literals (10 and "Invalid number")

I always have to work hard to teach you the basics of programming; when will you learn? ?