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  3. What is type of foo, if foo != foo?

What is type of foo, if foo != foo?

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  • P Palash Mondal_

    Recently had been debugging using the browser console, when I found this answer. Can you guess the type of foo here? Is it a string, function or else?

    L Offline
    L Offline
    Lost User
    wrote on last edited by
    #8

    It's 2015, IEEE 754 is from 1985, how does this still surprise people after 30 years?

    1 Reply Last reply
    0
    • P Palash Mondal_

      Yup, you are right but here foo is actually NaN, but the question is `What is type of foo` So, the real answer is `number` Since, typeof NaN returns "number" Cheers!

      A Offline
      A Offline
      Afzaal Ahmad Zeeshan
      wrote on last edited by
      #9

      Isn't it amazing, how NaN is a number, how a number is a word and how a word is a string. :doh:

      The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

      P Sander RosselS 2 Replies Last reply
      0
      • A Afzaal Ahmad Zeeshan

        Isn't it amazing, how NaN is a number, how a number is a word and how a word is a string. :doh:

        The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

        P Offline
        P Offline
        Palash Mondal_
        wrote on last edited by
        #10

        yup, the NaN stuff is amazing, but not sure about 'how a number is a word and how a word is a string' :confused:

        A 1 Reply Last reply
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        • P Palash Mondal_

          yup, the NaN stuff is amazing, but not sure about 'how a number is a word and how a word is a string' :confused:

          A Offline
          A Offline
          Afzaal Ahmad Zeeshan
          wrote on last edited by
          #11

          Great that you already know the NaN is a number. Now, if you have ever programmed in low-level, you would know that a word is a size given to a data, 1 byte, 2 byte etc. So the size of the register in CPU is a word; pre-defined size, doesn't matter 8-bit 16-bit or what. The size is number, thus, a number is word. :-) Now a word in our language, for example, "Hello", cannot be represented as a word in computer which needs some other type, which is string (array of characters), thus a word is a string. From here comes the metaphor, In programming, a number is a word and a word is a string. :cool:

          The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

          P N 2 Replies Last reply
          0
          • A Afzaal Ahmad Zeeshan

            Great that you already know the NaN is a number. Now, if you have ever programmed in low-level, you would know that a word is a size given to a data, 1 byte, 2 byte etc. So the size of the register in CPU is a word; pre-defined size, doesn't matter 8-bit 16-bit or what. The size is number, thus, a number is word. :-) Now a word in our language, for example, "Hello", cannot be represented as a word in computer which needs some other type, which is string (array of characters), thus a word is a string. From here comes the metaphor, In programming, a number is a word and a word is a string. :cool:

            The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

            P Offline
            P Offline
            Palash Mondal_
            wrote on last edited by
            #12

            Do you have any reference documentations for it? I want to learn about it more in-depth. Thanks!

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            • A Afzaal Ahmad Zeeshan

              Isn't it amazing, how NaN is a number, how a number is a word and how a word is a string. :doh:

              The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

              Sander RosselS Offline
              Sander RosselS Offline
              Sander Rossel
              wrote on last edited by
              #13

              Afzaal Ahmad Zeeshan wrote:

              Isn't it amazing, how NaN is a number

              Yes! Especially since NaN is short for "Not a Number"! X| My whole life is a lie!

              Visit my blog at Sander's bits - Writing the code you need. Or read my articles at my CodeProject profile.

              Simplicity is prerequisite for reliability. — Edsger W. Dijkstra

              Regards, Sander

              A 1 Reply Last reply
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              • P Palash Mondal_

                Do you have any reference documentations for it? I want to learn about it more in-depth. Thanks!

                A Offline
                A Offline
                Afzaal Ahmad Zeeshan
                wrote on last edited by
                #14

                Sure, read about Word in computer architecture[^] and the string data type[^]. One thing you should know is that there is no actual string type, it is just an array of characters. :-) Good luck for more in-depths.

                The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

                P 1 Reply Last reply
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                • Sander RosselS Sander Rossel

                  Afzaal Ahmad Zeeshan wrote:

                  Isn't it amazing, how NaN is a number

                  Yes! Especially since NaN is short for "Not a Number"! X| My whole life is a lie!

                  Visit my blog at Sander's bits - Writing the code you need. Or read my articles at my CodeProject profile.

                  Simplicity is prerequisite for reliability. — Edsger W. Dijkstra

                  Regards, Sander

                  A Offline
                  A Offline
                  Afzaal Ahmad Zeeshan
                  wrote on last edited by
                  #15

                  Clarified, but how is a number a word (the size of register) and how is a word actually a string (the data type)? :laugh: Plus, short form of your life is a lie (removing the F). :cool:

                  The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

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                  • A Afzaal Ahmad Zeeshan

                    Sure, read about Word in computer architecture[^] and the string data type[^]. One thing you should know is that there is no actual string type, it is just an array of characters. :-) Good luck for more in-depths.

                    The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

                    P Offline
                    P Offline
                    Palash Mondal_
                    wrote on last edited by
                    #16

                    Thanks for it. Have a nice day ahead! :)

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                    • P Palash Mondal_

                      Recently had been debugging using the browser console, when I found this answer. Can you guess the type of foo here? Is it a string, function or else?

                      J Offline
                      J Offline
                      Joan M
                      wrote on last edited by
                      #17

                      Any after overloading operators...

                      [www.tamautomation.com] | Robots, CNC and PLC machines for grinding and polishing. [YouTube channel]

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                      • M Manfred Rudolf Bihy

                        By definition undefined should be unequal to undefined. Is it? Cheers!

                        "I had the right to remain silent, but I didn't have the ability!"

                        Ron White, Comedian

                        L Offline
                        L Offline
                        Lost User
                        wrote on last edited by
                        #18

                        No, undefined compared with anything (anything includes also again undefined) is "an error" and therefore neither equal nor unequal... it is simply again undefined.

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                        • A Afzaal Ahmad Zeeshan

                          Great that you already know the NaN is a number. Now, if you have ever programmed in low-level, you would know that a word is a size given to a data, 1 byte, 2 byte etc. So the size of the register in CPU is a word; pre-defined size, doesn't matter 8-bit 16-bit or what. The size is number, thus, a number is word. :-) Now a word in our language, for example, "Hello", cannot be represented as a word in computer which needs some other type, which is string (array of characters), thus a word is a string. From here comes the metaphor, In programming, a number is a word and a word is a string. :cool:

                          The shit I complain about It's like there ain't a cloud in the sky and it's raining out - Eminem ~! Firewall !~

                          N Offline
                          N Offline
                          newton saber
                          wrote on last edited by
                          #19

                          Great explanation of how semantics and jargon are sometimes or often at odds with meaning.

                          1 Reply Last reply
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                          • P Palash Mondal_

                            Recently had been debugging using the browser console, when I found this answer. Can you guess the type of foo here? Is it a string, function or else?

                            N Offline
                            N Offline
                            newton saber
                            wrote on last edited by
                            #20

                            spoiler alert -- answer is below Opened Chrome Dev console and ran the following.

                            var x = 'garbage' / 10;

                            x
                            NaN

                            x != x // with coercion
                            true

                            x !== x // even without coercion
                            true

                            typeof(x)
                            "number"

                            P 1 Reply Last reply
                            0
                            • P Palash Mondal_

                              Recently had been debugging using the browser console, when I found this answer. Can you guess the type of foo here? Is it a string, function or else?

                              P Offline
                              P Offline
                              PIEBALDconsult
                              wrote on last edited by
                              #21

                              How about int ?

                              private static System.Random randy = new System.Random() ;
                              int foo { get { return ( randy.Next() ) ; } }

                              :-D

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                              • P PIEBALDconsult

                                How about int ?

                                private static System.Random randy = new System.Random() ;
                                int foo { get { return ( randy.Next() ) ; } }

                                :-D

                                D Offline
                                D Offline
                                Dennis_E
                                wrote on last edited by
                                #22

                                Or DateTime:

                                DateTime foo { get { return DateTime.Now; } }

                                :-D

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                                0
                                • N newton saber

                                  spoiler alert -- answer is below Opened Chrome Dev console and ran the following.

                                  var x = 'garbage' / 10;

                                  x
                                  NaN

                                  x != x // with coercion
                                  true

                                  x !== x // even without coercion
                                  true

                                  typeof(x)
                                  "number"

                                  P Offline
                                  P Offline
                                  Palash Mondal_
                                  wrote on last edited by
                                  #23

                                  Awesome :thumbsup:

                                  1 Reply Last reply
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                                  • P Palash Mondal_

                                    Recently had been debugging using the browser console, when I found this answer. Can you guess the type of foo here? Is it a string, function or else?

                                    U Offline
                                    U Offline
                                    User 11783308
                                    wrote on last edited by
                                    #24

                                    NaN

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