Unusual Raku Features

Post by rad_gruchalski » Wed, Nov 13, 2024, 6:41 PM UTC

maleldil wrote: post #122

7thaccount wrote: post #110

Earlier quoted context omitted.

That's a fair reaction to the post if you haven't looked at any normal Raku code. If you look at any of the introductory Raku books, it seems a LOT like Python with a C-like syntax. By that I mean the syntax is more curly-brace oriented, but the ease of use and built-in data structures and OO features are all very high level stuff. I think if you know any other high level scripting language that you would find Raku p…

Sure, but the fact that weird stuff is possible means that someone, at some point, will try to use it in your codebase. This might be prevented if you have a strong code review culture, but if the lead dev in the project wants to use something unusual, chances are no one will stop them. And once you start...

Post by kqr » Wed, Nov 13, 2024, 6:51 PM UTC

agnishom wrote: post #38

I don't understand why we want to use some language feature like Junctions, instead of using lists explicitly?

Post by donaldihunter » Wed, Nov 13, 2024, 7:17 PM UTC

xigoi wrote: post #143

b2gills wrote: post #68

Earlier quoted context omitted.

"Actual parsers" aren't powerful enough to be used to parse Raku. Raku regular expressions combined with grammars are far more powerful, and if written well, easier to understand than any "actual parser". In order to parse Raku with an "actual parser" it would have to allow you to add and remove things from it as it is parsing. Raku's "parser" does this by subclassing the current grammar adding or removing them in th…

Why are they called regular expressions if they can parse non-regular languages?

Post by ab5tract » Wed, Nov 13, 2024, 7:20 PM UTC

Joker_vD wrote: post #137

ab5tract wrote: post #133

Earlier quoted context omitted.

Got it, that makes sense based on the link. In Raku, the equivalent would be: my @a = [1,2],; The connection to junctions is still not very clear to me, however. A junction doesn’t really have any correlation to a single element version of a list. As a super-position of potential values, it doesn’t have many correlaries in other languages. For example, part of the original concept of junctions involved parallel evalu…

An array in Powershell, when piped to a command, automatically get this command invoked for each of the array's element and the results are combined into a new output array, which can be piped further. A junction in Raku, when given as an argument to a function, automatically applies this function to each of the junction's element and the results are combined into a new junction as a result. I don't know, seems like…

Post by antononcube » Wed, Nov 13, 2024, 7:33 PM UTC

bloopernova wrote: post #140

mempko wrote: post #25

I use Raku in production. It's the best language to deal with text because building parsers so so damn nice. I'm shocked this isn't the top language to create an LLM text pipeline.

Very late to the thread, but I was wondering if you knew of a good example of Raku calling an API over https, polling the API until it returns a specific value?

    use HTTP::UserAgent;
    use JSON::Fast;

    my $url = 'https://api.coindesk.com/v1/bpi/currentprice.json';

    my $ua = HTTP::UserAgent.new;

    my $total-time = 0;
    loop {
        my $response = $ua.get($url);
        if $response.is-success {
            my $data = from-json $response.content;
            my $rate = $data;
            say "Current chart name: $rate";
            #last if $rate eq 'Bitcoin';
            last if $total-time ≥ 16;
        }
        else {
            say "Failed to fetch data: {$response.status-line}";
        }
        sleep 3; # Poll every 3 seconds
        $total-time += 3;
    }