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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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  • M Manfred Rudolf Bihy

    Ok, I googled it. It's NaN! Cheers!

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

    Ron White, Comedian

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    Palash Mondal_
    wrote on last edited by
    #5

    Your are very near, but this is not the exact answer :)

    M 1 Reply Last reply
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    • P Palash Mondal_

      Your are very near, but this is not the exact answer :)

      M Offline
      M Offline
      Manfred Rudolf Bihy
      wrote on last edited by
      #6

      That's bullshit! I've tried it out and surely foo!=foo is true if foo is NaN.

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

      Ron White, Comedian

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      • M Manfred Rudolf Bihy

        That's bullshit! I've tried it out and surely foo!=foo is true if foo is NaN.

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

        Ron White, Comedian

        P Offline
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        Palash Mondal_
        wrote on last edited by
        #7

        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!

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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?

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          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?

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          • 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
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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 !~

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              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:

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                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 !~

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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 !~

                  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 !~

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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 !~

                        1 Reply Last reply
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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
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                          Palash Mondal_
                          wrote on last edited by
                          #16

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

                          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?

                            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.

                              1 Reply Last reply
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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
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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?

                                    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

                                      1 Reply Last reply
                                      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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