Spoiler Alert: This weekly challenge deadline is due in a few days from now (on February 26, 2023 at 23:59). This blog post offers some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
Task 1: Third Highest
You are given an array of integers.
Write a script to find out the Third Highest if found otherwise return the maximum.
Example 1
Input: @array = (5,3,4)
Output: 3
First highest is 5. Second highest is 4. Third highest is 3.
'A fair jaw-cracker dwarf-language must be.' -- Samwise Gamgee, The Lord of the Rings, II/iii: "The Ring Goes South", as quoted in regcomp.c, the Perl regular expression compiler.
As you would expect, this category gets you warnings about possibly-problematic regular expression constructions. A couple specific examples are:
Assuming NOT a POSIX class ...
This warning is about things that look kind of like POSIX character classes, but do not parse that way. The full diagnostic gives examples like [[:alnum]] (missing colon) and [[:digit:xyz] (missing right square bracket). These parse like simple character classes ([:[almnu]\] and [:[dgitxyz] respectively), so without the warning you get a hard-to-diagnose bug.
Unescaped left brace in regex is passed through ...
Efforts to eliminate unescaped left braces so that they are available for new syntax have been underway since 5.17.0, released May 2012. As I recall, this effort turned to be much harder than originally anticipated because at least one toolchain external to Perl (autoconf if memory serves) relied on this behavior.
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Spoiler Alert: This weekly challenge deadline is due in a few days from now (on February 19, 2023 at 23:59). This blog post offers some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
Task 1: Monotonic Array
You are given an array of integers.
Write a script to find out if the given array is Monotonic. Print 1 if it is otherwise 0.
An array is Monotonic if it is either monotone increasing or decreasing.
Monotone increasing: for i <= j , nums[i] <= nums[j]
Monotone decreasing: for i <= j , nums[i] >= nums[j]
The re module provides functionality relating to Perl's regular expressions. It is either a module in the sense of potentially exporting stuff into your name space or a pragma in the sense of modifying the behavior of Perl within a lexical scope, or both, depending on how you use it.
The pragmatic functionality tweaks the regular expressions themselves in various ways:
Time to look back and review how the year 2021 was for me.
Perl Weekly newsletter
As you all know, I have been editing Perl weekly newsletterGabor Szabo. We agreed, I edit the even numbered newsletter and Gabor would do odd numbered ones. So that way, I got the honour to edit the 500th edition of the weekly newsletter. I am now looking forward to my personal, 100th edition. As of today, I have edited 96 in total.
The [Perl] Weekly Challenge
Thanks to the Team PWC, I completed one more year of weekly challenge. It may not sound a big deal but for me it is. I wouldn't have done without the support of the team. I would like to mention one name, Colin Crain, our in-house, Perl reviewer for the hard work in reviewing Perl solutions every week without fail for so many months now.
Spoiler Alert: This weekly challenge deadline is due in a couple of days from now (on February 12, 2023 at 23:59). This blog post offers some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
Task 1: Special Quadruplets
You are given an array of integers.
Write a script to find out the total special quadruplets for the given array.
Special Quadruplets are such that satisfies the following 2 rules.1) nums[a] + nums[b] + nums[c] == nums[d]2) a < b < c < d
Example 1
Input: @nums = (1,2,3,6)
Output: 1
Since the only special quadruplets found is $nums[0] + $nums[1] + $nums[2] == $nums[3].
Perl possesses a rich and expressive set of operators. So rich, in fact, that other adjectives can come to mind, such as prolix, or even Byzantine.
Requests for help navigating Perl's operator space appear repeatedly on outlets such as PerlMonks. These seem to me to involve two sorts of confusion: precedence (discussed here) and functionality (string versus numeric -- maybe another blog post).
The precedencewarnings category has some help here, though as of Perl 5.34 there are only two diagnostics under it:
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Spoiler Alert: This weekly challenge deadline is due in a few days from now (on February 5, 2023 at 23:59). This blog post offers some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
Task 1: Consecutive Odds
You are given an array of integers.
Write a script to print 1 if there are THREE consecutive odds in the given array otherwise print 0.
When I first came to Perl I thought the qw{} construction was pretty neat. Give it a bunch of white-space-delimited text and it gives you back a list separated on the blanks. So
say for qw{ Fee fie foe fum! };
prints 'Fee', 'fie', 'foe', and 'fum!', each on its own line. But if you add punctuation, and warnings are enabled,
say for qw{ Fee, fie, foe, fum! };
gets you 'Possible attempt to separate words with commas ...'.
For a while, I was dealing with this using a weird assortment of quoting techniques. But then I discovered how to tell Perl I meant to do that:
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One of the reasons I have not "moved on" from Perl to some other more "modern" language is that Perl gives me such great access to its inner workings. The Do-It-Yourself Lexical Pragmas post from a couple weeks ago is an example of this. Another example is that Perl lets you tie your own code into its warnings system.
Tying into the warnings machinery requires a module. That is, the interface assumes you are reporting problems relative to another name space that invoked your code. Your module can either add diagnostics to existing Perl warning categories or actually create new categories. In either case your diagnostics are sensitive to the enablement or disablement of the category, as well as its fatalization.
In addition to enabling or disabling warning categories, use warnings ... and no warnings ...; make some subroutines available which can be used to issue your own diagnostics. These are reported relative to the file and line that called into your module (sort of like carp()). A useful subset of the warnings:: subroutines is:
