RogerBW's Blog

I’ve been doing the Weekly Challenges. The latest involved word counting and code validation. (Note that this ends today.)

Task 1: Max Words

You are given an array of sentences.

Write a script to return the maximum number of words that appear in a single sentence.

Using a crude definition that ignores punctuation, this is easy enough: split strings on spaces, count words, take maximum. JavaScript:

function maxwords(a) {
    return Math.max(...a.map(x => x.split(" ").length ));
}

Task 2: Validate Coupon

You are given three arrays, @codes, @names and @status.

Write a script to validate codes in the given array.

A code is valid when the following conditions are true:

• codes[i] is non-empty and consists only of alphanumeric characters (a-z, A-Z, 0-9) and underscores (_).

• names[i] is one of the following four categories: 'electronics', 'grocery', 'pharmacy', 'restaurant'.

• status[i] is true.

Return an array of booleans indicating validity: output[i] is true if and only if codes[i], names[i] and status[i] are all valid.

The codes validation is most readily done by regexp, where that's available. names is validated by checking for presence in a set (though passing around strings is a warning sign that these people need a lot more expensive tech consultancy). And status is simply a boolean. In Raku:

sub validatecoupon(@codes, @names, @status) {
    my %dep = ["electronics", "grocery", "pharmacy", "restaurant"].Set;
    my @out;
    for 0 .. @codes.end -> $i {
        if (@codes[$i] ~~ /^<[0..9A..Za..z_]>+$/) &&
        (%dep{@names[$i]}:exists) &&
        @status[$i] {
            @out.push(True);
        } else {
            @out.push(False);
        }
    }
    @out;
}

Full code on github.