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WesleyJohnson • 11/20/2024 • 1 reply • view on HN

That's a bit biased, no? The actual comparison should be:

  filtered = Q(l,{'name__contains':"k", "age__lt":20})
Verus:

  filtered = [x for x in l if ('k' in x['name'] and int(x['age']) < 20)]

Replies

MathMonkeyMan • 11/21/2024

Something like Clojure would be perfect for this. Write a macro that converts

    {"name" (includes? "k"), "age" (< 20)}
into

    {"name" #(includes? % "k"), "age" #(< % 20)}
which is the same as

    {"name" (fn [name] (includes? name "k")), "age" (fn [age] (< age 20))}
Then have another macro that converts that into the pattern matching code, or maybe there's already something in the standard library.

You could serialize the patterns using EDN as a substitute for JSON.

Fun stuff.

I wrote something [similar][1] in javascript. With that it would be:

    const is_k_kid = tisch.compileFunction((etc) => ({
      'name': name => name.includes('k'),
      'age': age => age < 20,
       ...etc
    }));
    const result = input.filter(is_k_kid);
Yes, "...etc" is part of the DSL.

[1]: https://github.com/dgoffredo/tisch