Peter
Peter Campbell Smith

Pulling the strings

Weekly challenge 239 — 16 October 2023

Week 239 - 16 Oct 2023

Task 1

Task — Same string

You are given two arrays of strings, @arr1 and @arr2. Write a script to find out if the word created by concatenating the array elements is the same.

Examples


Example 1
Input: @arr1 = ("ab", "c")
       @arr2 = ("a", "bc")
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"

Example 3
Input: @arr1 = ("ab", "cd", "e")
       @arr2 = ("abcde")
Output: true

Using @arr1, word1 => "ab" . "cd" . "e" => "abcde"
Using @arr2, word2 => "abcde"

Analysis

The handling of strings is one of Perl's strengths and allows this task to be solved in essentially no lines of code at all. I just used the say statetment that outputs the answer to join() each of the arrays, compare the results, and output true or false depending on whether they match.

Try it 

Try running the script with any input, for example:
abc, def, ghi and a, bcd, efg, hi



Script


#!/usr/bin/perl

use v5.16;    # The Weekly Challenge - 2023-10-16
use utf8;     # Week 239 task 1 - Same string
use strict;   # Peter Campbell Smith
use warnings; # Blog: http://ccgi.campbellsmiths.force9.co.uk/challenge

same_string(['ab', 'c'], ['a', 'bc']);
same_string(['ac', 'b'], ['a', 'bc']);
same_string(['the', 'cat', 'sat', 'on', 'the', 'mat'], ['thec', 'atsa', 'tont', 'hema', 't']);
same_string(['the', 'cat', 'sat', 'on', 'the', 'mat'], ['the', 'dog', 'sat', 'on', 'the', 'rug']);

sub same_string {
    
    # show input
    say qq[\nInput:  \@arr1 = ('] . join(q[', '], @{$_[0]}) . q[')];
    say qq[        \@arr2 = ('] . join(q[', '], @{$_[1]}) . q[')];
    
    # show output by comparing the joins of the 2 arrays
    say qq[Output: ] . (join('', @{$_[0]}) eq join('', @{$_[1]}) ? 'true' : 'false');
}
    

Output


Input:  @arr1 = ('ab', 'c')
        @arr2 = ('a', 'bc')
Output: true

Input:  @arr1 = ('ac', 'b')
        @arr2 = ('a', 'bc')
Output: false

Input:  @arr1 = ('the', 'cat', 'sat', 'on', 'the', 'mat')
        @arr2 = ('thec', 'atsa', 'tont', 'hema', 't')
Output: true

Input:  @arr1 = ('the', 'cat', 'sat', 'on', 'the', 'mat')
        @arr2 = ('the', 'dog', 'sat', 'on', 'the', 'rug')
Output: false

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