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Modern Programming

Scheduled Pinned Locked Moved Programmer Humor
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  • kn0wmad1c@programming.devK [email protected]

    num % 2 isn't a boolean result in any of these languages, so I feel like it would always output "odd"

    Edit: 0 is false, everything else is true.

    maven@lemmy.zipM This user is from outside of this forum
    maven@lemmy.zipM This user is from outside of this forum
    [email protected]
    wrote on last edited by
    #13

    In JS 0 is the same as False

    L 1 Reply Last reply
    2
    • kn0wmad1c@programming.devK [email protected]

      num % 2 isn't a boolean result in any of these languages, so I feel like it would always output "odd"

      Edit: 0 is false, everything else is true.

      moomoomoo309@programming.devM This user is from outside of this forum
      moomoomoo309@programming.devM This user is from outside of this forum
      [email protected]
      wrote on last edited by
      #14

      All of those languages will convert numbers into booleans, 0 is false, all other numbers are true.

      kn0wmad1c@programming.devK 3 Replies Last reply
      7
      • kn0wmad1c@programming.devK [email protected]

        num % 2 isn't a boolean result in any of these languages, so I feel like it would always output "odd"

        Edit: 0 is false, everything else is true.

        C This user is from outside of this forum
        C This user is from outside of this forum
        [email protected]
        wrote on last edited by
        #15

        The joys of dynamic typing.

        1 Reply Last reply
        1
        • moomoomoo309@programming.devM [email protected]

          All of those languages will convert numbers into booleans, 0 is false, all other numbers are true.

          kn0wmad1c@programming.devK This user is from outside of this forum
          kn0wmad1c@programming.devK This user is from outside of this forum
          [email protected]
          wrote on last edited by
          #16

          Ah, that makes sense.

          1 Reply Last reply
          0
          • kn0wmad1c@programming.devK [email protected]

            num % 2 isn't a boolean result in any of these languages, so I feel like it would always output "odd"

            Edit: 0 is false, everything else is true.

            K This user is from outside of this forum
            K This user is from outside of this forum
            [email protected]
            wrote on last edited by
            #17

            0 is false in C, Python, and JS. It should work

            1 Reply Last reply
            6
            • kn0wmad1c@programming.devK [email protected]

              num % 2 isn't a boolean result in any of these languages, so I feel like it would always output "odd"

              Edit: 0 is false, everything else is true.

              M This user is from outside of this forum
              M This user is from outside of this forum
              [email protected]
              wrote on last edited by
              #18

              You'd be surprised.

              But seriously, numbers can be used as booleans in an impressive number of languages. Including machine code for almost every machine out there.

              1 Reply Last reply
              1
              • entropicdrift@lemmy.sdf.orgE [email protected]
                print("odd" if num % 2 else "even")
                

                That's the native python version, for those curious

                K This user is from outside of this forum
                K This user is from outside of this forum
                [email protected]
                wrote on last edited by
                #19

                Why is the return first?

                J B 2 Replies Last reply
                7
                • moomoomoo309@programming.devM [email protected]

                  All of those languages will convert numbers into booleans, 0 is false, all other numbers are true.

                  kn0wmad1c@programming.devK This user is from outside of this forum
                  kn0wmad1c@programming.devK This user is from outside of this forum
                  [email protected]
                  wrote on last edited by
                  #20

                  That makes sense. However, num % 2 equaling 0 would mean it's even, and not "odd" like the ternary operator is outputting, yeah?

                  1 Reply Last reply
                  0
                  • moomoomoo309@programming.devM [email protected]

                    All of those languages will convert numbers into booleans, 0 is false, all other numbers are true.

                    kn0wmad1c@programming.devK This user is from outside of this forum
                    kn0wmad1c@programming.devK This user is from outside of this forum
                    [email protected]
                    wrote on last edited by
                    #21

                    Ah that makes sense.

                    satyrsack@lemmy.sdf.orgS 1 Reply Last reply
                    2
                    • kn0wmad1c@programming.devK [email protected]

                      num % 2 isn't a boolean result in any of these languages, so I feel like it would always output "odd"

                      Edit: 0 is false, everything else is true.

                      sleeplessone@lemmy.mlS This user is from outside of this forum
                      sleeplessone@lemmy.mlS This user is from outside of this forum
                      [email protected]
                      wrote on last edited by
                      #22

                      In JS at least, there's a concept of truthiness and falsiness. 0, undefined, null, and a few other non-boolean values are treated as false if used in conditionals and logical operations, while every other value is treated as true. I'm pretty sure python has something similar.

                      H 1 Reply Last reply
                      4
                      • K [email protected]

                        Why is the return first?

                        J This user is from outside of this forum
                        J This user is from outside of this forum
                        [email protected]
                        wrote on last edited by
                        #23

                        I think the idea is it reads more naturally, so you can read it like this return A if statement is true else return B

                        N 1 Reply Last reply
                        16
                        • entropicdrift@lemmy.sdf.orgE [email protected]
                          print("odd" if num % 2 else "even")
                          

                          That's the native python version, for those curious

                          D This user is from outside of this forum
                          D This user is from outside of this forum
                          [email protected]
                          wrote on last edited by
                          #24

                          The ternary syntax is really my only real gripe with python design -- putting the conditional BETWEEN the true and false values feels so very messy to me.

                          rbos@lemmy.caR B idunnololz@lemmy.worldI 3 Replies Last reply
                          83
                          • K [email protected]

                            Why is the return first?

                            B This user is from outside of this forum
                            B This user is from outside of this forum
                            [email protected]
                            wrote on last edited by [email protected]
                            #25

                            Edit... I reread your comment and realized that python does it differently and that everything I typed was irrelevant... I'm still gonna leave it if anyone is interested in ternary expressions, but I suppose the answer to your question is, that's just how python does it.

                            That's how ternary operators are designed to work. In essence, if you're looking to do a single line if/then, you can directly assign a variable from the result of a ternary expression.

                            As an example, I was scripting something earlier where there may or may not be a value returned from a function, but I still had to do something with that return value later. For this thing, I was using JavaScript.

                            I ended up with:

                            return platform == "name"  ? "Option 1" : "Option 2"
                            

                            If I were to write that out in a typical if/then it would be:

                            if (platform == "name") {
                                return "option 1"
                            } else {
                                return "option 2"
                            }
                            
                            

                            A ternary starts with a boolean expression, then the if true value, else the false value. That's returned to either a variable or if in a function like my example, to the object calling the function. It's just a way to write less code that in many cases is easier to read.

                            1 Reply Last reply
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                            • P [email protected]

                              Yeah... I played that "serial killer or programming language inventor" game.

                              The only one I was completely in disagreement with was the inventor of Python. He's definitely a mass-murderer

                              C This user is from outside of this forum
                              C This user is from outside of this forum
                              [email protected]
                              wrote on last edited by [email protected]
                              #26

                              Are you sure it isn't just that he's Dutch?

                              1 Reply Last reply
                              4
                              • D [email protected]

                                The ternary syntax is really my only real gripe with python design -- putting the conditional BETWEEN the true and false values feels so very messy to me.

                                rbos@lemmy.caR This user is from outside of this forum
                                rbos@lemmy.caR This user is from outside of this forum
                                [email protected]
                                wrote on last edited by
                                #27

                                It's kinda natural to me having used Perl a lot.

                                S L 2 Replies Last reply
                                12
                                • R [email protected]

                                  Python does that, too.

                                  https://docs.python.org/3/library/stdtypes.html#boolean-operations-and-or-not

                                  satyrsack@lemmy.sdf.orgS This user is from outside of this forum
                                  satyrsack@lemmy.sdf.orgS This user is from outside of this forum
                                  [email protected]
                                  wrote on last edited by
                                  #28

                                  Are you just referring to how Python uses the English and/or instead of the more common &&/||? I think what the user above you was talking about was Lua's strange ternary syntax using and/or.

                                  lime@feddit.nuL 1 Reply Last reply
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                                  • kn0wmad1c@programming.devK [email protected]

                                    Ah that makes sense.

                                    satyrsack@lemmy.sdf.orgS This user is from outside of this forum
                                    satyrsack@lemmy.sdf.orgS This user is from outside of this forum
                                    [email protected]
                                    wrote on last edited by
                                    #29

                                    It doesn't make sense. I understand it, but it doesn't make sense.

                                    L 1 Reply Last reply
                                    1
                                    • entropicdrift@lemmy.sdf.orgE [email protected]

                                      Python is kinda like that in general, unless you try to make it read like ass

                                      W This user is from outside of this forum
                                      W This user is from outside of this forum
                                      [email protected]
                                      wrote on last edited by
                                      #30

                                      You would not believe the number of people I’ve interviewed who excel at making Python read like ass.

                                      entropicdrift@lemmy.sdf.orgE 1 Reply Last reply
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                                      • W [email protected]

                                        You would not believe the number of people I’ve interviewed who excel at making Python read like ass.

                                        entropicdrift@lemmy.sdf.orgE This user is from outside of this forum
                                        entropicdrift@lemmy.sdf.orgE This user is from outside of this forum
                                        [email protected]
                                        wrote on last edited by
                                        #31

                                        I mean, it does have enough ways to write the same thing that it can really allow for some funny code golf, but some people just have no sense of readability whatsoever.

                                        1 Reply Last reply
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                                        • rbos@lemmy.caR [email protected]

                                          It's kinda natural to me having used Perl a lot.

                                          S This user is from outside of this forum
                                          S This user is from outside of this forum
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                                          wrote on last edited by
                                          #32

                                          That's not quite the argument you might think it is

                                          rbos@lemmy.caR 1 Reply Last reply
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