#+title: Challenge 186
#+date: 2022-10-27
#+html_link_up: ../
#+export_file_name: index
#+options: toc:nil
#+setupfile: ~/.emacs.d/org-templates/level-2.org

* Task 1 - Zip List

You are given two list @a and @b of same size.

Create a subroutine sub zip(@a, @b) that merge the two list as shown in
the example below.

#+begin_src
Input:  @a = qw/1 2 3/; @b = qw/a b c/;
Output: zip(@a, @b) should return qw/1 a 2 b 3 c/;
        zip(@b, @a) should return qw/a 1 b 2 c 3/;
#+end_src

** Raku

~zip~ takes two arrays, iterates over ~0...elems~ and takes entries from
both arrays, stores them in third array & returns that.

#+begin_src raku
# zip takes two arrays and returns a list.
sub zip(@a, @b --> List) {
    die if @a.elems !== @b.elems;
    my @c;
    @c.push(@a[$_], @b[$_]) for ^@a.elems;
    return @c;
}
#+end_src