isNumber(-) give true ??

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isNumber(-) give true ??

Postby jguillou » Tue Apr 10, 2018 2:51 pm

With 4.8b31 put IsNumber("-") or isNumber(-) give true ? With 4.7 isNumber(-) give false. Why ?
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Re: isNumber(-) give true ??

Postby codegreen » Tue Apr 10, 2018 7:09 pm

That's a bug.

The SC interpreter's numerical code was all rewritten in 4.8 to use the Cocoa NSDecimal API, which greatly extends its numerical precision and range.

Unbeknownst to me though (and AFAICT not mentioned in the docs) apparently when you pass a string consisting solely of a lone plus or minus sign (as opposed to say an X or some other non-numerical character) to NSDecimal's initWithString method, rather than getting back the usual NaN (i.e., Not a Number) instead you get 0 (zero).

Live and learn...

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