PWC239 - Same String


Here we are with TASK #1 from The Weekly Challenge #239. Enjoy!

The challenge

You are given two arrays of strings.

Write a script to find out if the word created by concatenating the array elements is the same.

Example 1

Input: @arr1 = ("ab", "c")

Output: true

Using @arr1, word1 => "ab" . "c" => "abc"
Using @arr2, word2 => "a" . "bc" => "abc"

Example 2

Input: @arr1 = ("ab", "c")
       @arr2 = ("ac", "b")
Output: false

Using @arr1, word1 => "ab" . "c" => "abc"
Using @arr2, word2 => "ac" . "b" => "acb"

The questions

This time I have a meta-question… how is people addressing the problem of getting the inputs from the command line?

Well, apart from this I’d probably ask what the same means. E.g. should differently-accented character count as same? I’ll assume not…

The solution

We’re starting with Raku and we’re going the easy way, joining all strings together and comparing the results:

#!/usr/bin/env raku
use v6;
sub MAIN ($s1, $s2) { say is-same-string($s1.split(/\,/), $s2.split(/\,/)) }

sub is-same-string (@s1, @s2) { @s1.join('') eq @s2.join('') }

For the Perl counterpart, we’re going the over-engineering way and assume that there might be several input arrays, as well as avoiding to merge them in single strings and instead iterate them character by character:

#!/usr/bin/env perl
use v5.24;
use warnings;

my ($s1, $s2) = map { [ split m{,}mxs ]  } @ARGV[0,1];
say is_same_string($s1, $s2) ? 'true' : 'false';

sub is_same_string {
   my ($lead, @other) = map {
      my $aref = $_;
      my $idx = 0;
      my $ch_idx = 0;
      sub {
         while ($idx <= $aref->$#*) {
            return substr($aref->[$idx], $ch_idx++, 1)
               if $ch_idx < length($aref->[$idx]);
            $ch_idx = 0;
   } @_;
   while ('necessary') {
      my $ch = $lead->();
      if (! defined($ch)) {
         for my $it (@other) {
            return 0 if defined($it->());
         return 1;
      for my $it (@other) {
         my $och = $it->();
         return 0 if ($och // '') ne $ch;

Cheers and… stay safe!

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