• Synthead@lemmy.world
    link
    fedilink
    English
    arrow-up
    14
    ·
    11 months ago

    Ruby has a method for this :)

    [1] pry(main)> vars = ["one", "two", nil, "three"]
    => ["one", "two", nil, "three"]
    [2] pry(main)> vars.compact
    => ["one", "two", "three"]
    

    In Ruby, 0 and "" is truthy, so this would be a little different than the Python interpretation. You could filter with #select, but you’d typically write your code around this instead.

      • Die Martin Die@sh.itjust.works
        link
        fedilink
        arrow-up
        8
        ·
        11 months ago

        Lua is the same. Only false and nil are “falsey”.

        I remember I fixed a bug in a mod for Minetest that assumed 0 was false and caused an infinite loop.

      • Synthead@lemmy.world
        link
        fedilink
        English
        arrow-up
        4
        ·
        edit-2
        11 months ago

        Yup :) Everything in Ruby inherits Object, too. It’s a really neat language, and when you get accustomed to it, you might wonder why some other languages aren’t written like it.

        For the 0 value being truthy, consider that Ruby is a dynamic language. Imagine if you asked a user how many motorcycles they own. If they answer, you’ll have an Integer. If they don’t, you’ll have nil, from NilClass. 0 is just as valid of an answer as 2, so you can do something like this:

        raise NoResponse unless motorcycles
        
        save_motorcycles(motorcycles)
        
      • DarkenLM@kbin.social
        link
        fedilink
        arrow-up
        4
        ·
        11 months ago

        And people bash Javascript as if it was the devil when thinks like this exist on other languages.

    • calcopiritus@lemmy.world
      link
      fedilink
      arrow-up
      2
      ·
      11 months ago

      Python also has about 9000 alternatives that are better than this.

      Allowing anything other than variables, number literals, and ‘:’ inside list indices was a mistake.