Roku Developer Program

[EnTerr]

i tried using StrToI and noticed it does not behave as advertised:

StrToI(str as String) as Dynamic
Return the integer value of the string, or invalid if str is not a string.

I can see the intent was to return invalid if the string does not parse well, since the return type is Dynamic and not Integer. But nowadays it returns 0 instead, doc and behavior are out-of-sync.

Also, when speaking of conversion string -> int, what are the differences between strtoi(str), string.toint() and val(str, 10)? 

[Komag]

"EnTerr" wrote:
Also, when speaking of conversion string -> int, what are the differences between strtoi(str), string.toint() and val(str, 10)? 

I second this question 😄

[RokuKC]

"EnTerr" wrote:
i tried using StrToI and noticed it does not behave as advertised:

The documentation is incorrect. Thanks for pointing it out.

The functions you mention are all essentially equivalent.

[EnTerr]

Thank you... a follow-up question: how am i supposed to determine if a string is actually a proper number?
Having the `invalid` flag would have covered it. Lacking that, such check seems to shard into a fractal of special cases ("so, i got 0 back? maybe it was a real 0 - or maybe it wasn't; maybe it has whitespaces, plus/minus in front - or maybe it starts with digit but ends with letters...")

[belltown]

"EnTerr" wrote:
how am i supposed to determine if a string is actually a proper number?

Define what you mean by a 'proper number' and use a regular expression to check for that:

function isProperNumber(s as dynamic) as boolean
    isProper = false
    if GetInterface(s, "ifString") <> invalid
        re = CreateObject("roRegex", "^\s*[+-]?\d+$", "")
        if re.IsMatch(s)
            isProper = true
        end if
    end if
    return isProper
end function

[EnTerr]

"belltown" wrote:

"EnTerr" wrote:
how am i supposed to determine if a string is actually a proper number?

Define what you mean by a 'proper number' and use a regular expression to check for that

Exactly my point! I don't want to define myself what a proper number format is - i want to delegate that to Roku's implementation. Would not like to play catch-up with parser changes, that's an error-prone chase game - it's not like the Co will spec out what a "number" is to them. Fancy a guess what the below outcome is?

Brightscript Debugger> ? val("0x123456")