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this post was submitted on 31 Jul 2024
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If you think
is-numbercan be replaced with a one-liner, you don't have the enterprise code mindset. What if the world gets more inclusive and MMXXIV, ยฝ and โ ผโ become recognized as numbers? ๐๐พ were numbers in the past but what if people start assigning numeric value to other characters? Are ๐๐๐ฏ๐ข๐ต๐๐ numbers of the future???/s
I'm not even all kidding, Regex implementations are split on whether "ูฃ" matches
\d.All junior devs should read OCs comment and really think about this.
The issue is whether
is_number()is performing a semantic language matter or checking whether the text input can be converted by the program to a number type.The former case - the semantic language test - is useful for chat based interactions, analysis of text (and ancient text - I love the cuneiform btw) and similar. In this mode, some applications don't even have to be able to convert the text into eg binary (a 'gazillion' of something is quantifying it, but vaguely)
The latter case (validating input) is useful where the input is controlled and users are supposed to enter numbers using a limited part of a standard keyboard. Clay tablets and triangular sticks are strictly excluded from this interface.
Another example might be
is_address(). Which of these are addresses? '10 Downing Street, London', '193.168.1.1', 'Gettysberg', 'Sir/Madam'.To me this highlights that code is a lot less reusable between different projects/apps than it at first appears.