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Counterpoint: It's well known that Anywhere Software works hard to make B4X available for beginners and shield them (and all of its users, really) from many of the complexities with developing applications. I think it's entirely fair to assume that the current behaviour of IsNumber simply is an ov
link: The IsNumber function returns TRUE by "1f" and "1d". So IsNumber gives unexpected results if you are not aware of this. Can the IsNumber function be c
link: 1f and 1d are valid numbers (java syntax for 1 as a float and 1 as a double)

Using IIF and IsNumber is a good solution. In some cases, when empty string can equal zero, you can use the trick: Dim Value As Int Value = "0" & SomeB4XView.Text (even directly in expressions, if desired)
link: This can be achieved using the IsNumber function to check if the string represents a numeric value. Here’s how you can refactor your code: ' Ensure th
link: clvLabel4.Text = IIf(IsNumber(mapatarifas.Get("CP")), mapatarifas.Get("CP"), "") clvLabel5.Text = IIf(IsNumber(clvLabel4.Text), IIf(clvLabel4.Text
link: ? mapatarifas is Map clvLabel4.Text = IIf(IsNumber(mapatarifas.Get("CP")), mapatarifas.Get("CP"), 0) clvLabel5.Text = IIf(clvLabel4.Text.As(Double) >

so it's argument is first converted to a string "NaN" ' which is (paradoxically) interpreted as a valid a number Log(IsNumber(Sqrt(-1))) 'True Log(IsNumber(0 / 0)) 'True Log(IsNumber(0)) 'True
link: One important fact to know! Integers and Longs do not respond to NaN in the way that floats or doubles do 'The Integer type converts "NaN" into

Why not IsNumber( arrString(r) ) ? https://www.b4x.com/android/help/core.html#keywords_isnumber
link: After the early exit for null-check, just add this: arrString(r).Replace(",", ".") Basically a crutch to help IsNumber (and B4A) to see things our w
link: Yes, thanks, didn't think of that one. Have done some testing now and it seems using the byte array is a bit faster, but of course using IsNumber is a
link: Noticed that B4A (and IsNumber) considers the comma not a valid decimal separator, so have to think how to handle that. RBS

I've managed to reproduce the IsNumber null error within B4A. If you don't initialize a type instance the string items contain null rather than empty strings. Sub Button1_Click Dim x As configuration_ If IsNumber(x.language)=False Then ' NullPointerException here Log("False") End
link: That's a bit weird. The error seems to be in the IsNumber keyword call but IsNumber looks like this public static boolean IsNumber(String Text) {
link: Ah! Silly me - I failed to notice catch (NumberFormatException e) So it won't catch the NullPointerException so you need that extra Null test to avo
link: Thanks for your feedback. Main.configuration.language must have always have a value beetwen 0 and 15. I had add the line by precaution If IsNum

isnumber(text1.text) works for me . Thanks !
link: text1.contains checks if a string is found in text1. If it's an edittext just Change the input_type to numbers so the user can only Input numbers (or

The IsNumber function returns TRUE by "1f" and "1d". So IsNumber gives unexpected results if you are not aware of this. So I mean: Can the IsNumber function be changed in a next update?
link: I discovered the problem with IsNumber by accident and found the cause thanks to the Community. It causes hard-to-find errors. Can the <IsNumber> func
link: https://www.b4x.-1f-true.74477/post-472841 You solved it there, with the code the OP posted in his post.
link: Please use code here... tags when posting code. Which problem are you referring to?

IsNumber can be useful for such cases: If IsNumber(EditText1.Text) Then x = EditText1.Text + 10

IMHO, isNumber correctly returns True for "+41987654321" because the plus sign indicates a positive number. I can't understand why you'd like to store a telephone number as a numeric value instead of a string/text, if that's your goal (in fact, I'm not sure to have understood it correctly).
link: Task is automatically recognize the field type for the database table creation. And phone number must be String type (for preserving +), but isNumber
link: HI, All It seems to me, that phone number like "+41987654321" - is not a number for the database, but isNumber function = True. Trouble is that SMS
link: https://www.oreilly.com/library/view/regular-expressions-.html This may be your solution; use regex to test the candidate string and if it's a phone n

This code will work: Label1.Text = IIf(IsNumber(EditText1.Text), EditText1.Text * 10, "Invalid number")
link: Not if you test it with: Label1.Text = IIf(IsNumber(EditText1.Text), EditText1.Text * 10, "Invalid number") ;)
link: 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 "

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