Re: A short whishlist of Perl5 improvements leaping to Perl7

With your emphasis of the word "modern", you seem to be implying that variable declaration is old-fashioned and it is more modern to auto-declare them.

However, the opposite is true. Javascript introduced a strict mode in ECMAScript 5, with variable declarations required, and its use is increasingly being encouraged.

The various varieties of Visual Basic (VB.NET, VBA, etc) have "Option Explicit" which forces you to declare variables before using them. Microsoft's documentation for the language says "Setting Option Explicit to Off is generally not a good practice".

toby döt ink

Comment on Re: A short whishlist of Perl5 improvements leaping to Perl7

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Re^2: A short whishlist of Perl5 improvements leaping to Perl7 by kennethk (Abbot) on Nov 24, 2020 at 15:29 UTC
Auto-declaration has a much older history than that. For example, Fortran 77 (and probably earlier) implicitly typed variables that were undeclared based upon their first letter. Woe to those who forgot `implicit none` at the start of every subroutine. I am honestly horrified that Guido thought that declaring variables was a Bad Thing. Larry should have known better too, but at least `use strict;` disables that behavior. #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l] [select]
Re^3: A short whishlist of Perl5 improvements leaping to Perl7 by jcb (Parson) on Nov 25, 2020 at 00:03 UTC
Perl probably inherited undeclared variables from Awk and shell, both of which create variables when they are set, in contrast to C, which requires all variables be declared with types.	[reply]
Re^4: A short whishlist of Perl5 improvements leaping to Perl7 by kennethk (Abbot) on Nov 25, 2020 at 16:39 UTC
I agree with the origins; I just wish that Perl had rolled a `no strict;` into `-e` rather than providing no constraint on variables in proper scripts. #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l] [select]
Re^5: A short whishlist of Perl5 improvements leaping to Perl7 by LanX (Saint) on Nov 25, 2020 at 17:06 UTC


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