GNU bug report logs - #59531
29.0.50: An alternative to `string-to-number` which throws an error (or returns a NIL value) when input is non-parseable as number

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From: Ramesh Nedunchezian <rameshnedunchezian <at> outlook.com>
To: 59531 <at> debbugs.gnu.org
Subject: bug#59531: 29.0.50: An alternative to `string-to-number` which throws an error (or returns a NIL value) when input is non-parseable as number
Date: Thu, 24 Nov 2022 11:44:43 +0530

`string-to-number` returns ZERO if the input is not a number.  


This return value is not very helpful.  The choice of a number ZERO as "Not A Number" doesn't help one to distinguish between the following two cases

(1) Input was a valid number, and it parses to number zero

(2) Input was NOT a valid number, and it was forcibly reported as ZERO

Consider amending `string-to-number` to throw an error (or return NIL) when the input is not parseable as a number, or providing an alternative API to validate numbers.  I am trying to parse some fields in an org table, and see if the field value is a number or not;

If there is already an alternative to what I am trying to accomplish, I would appreciate a recipe.

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