Wish B4X IIF Function

MrKim · Jul 15, 2020

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.

B4X:

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 · Jul 15, 2020

MrKim said:
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 · Jul 17, 2020

Martin Larsen · Aug 18, 2020

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

DonManfred · Aug 18, 2020

Martin Larsen said:
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 · Aug 18, 2020

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 · Aug 18, 2020

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 · Aug 18, 2020

LucaMs said:
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.

LucaMs said:
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 · Aug 18, 2020

Martin Larsen said:
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 · Jun 24, 2021

LucaMs said:
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 · Jun 24, 2021

MrKim said:
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 · Jun 24, 2021

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

LucaMs · Jun 24, 2021

Erel said:
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 · Jun 24, 2021

This code will work:

B4X:

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

MrKim · Jun 27, 2021

LucaMs said:
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 · Jun 27, 2021

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

For IIF too.

B4X:

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 · Jun 27, 2021

LucaMs said:
For IIF too.

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

LucaMs · Jun 27, 2021

Erel said:
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 · Jun 27, 2021

LucaMs said:
BTW "TextField1.Text * 10" is bad programming

Not if you test it with:

B4X:

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

LucaMs · Jun 27, 2021

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

and also the second calculation.

Erel said:
Not if you test it with:

B4X:

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? ?

Wish B4X IIF Function

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