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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

    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

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    Palash Mondal_
    wrote on last edited by
    #3

    Nope, `undefined` is not the answer. Since `undefined == undefined` returns true in console.

    M 1 Reply Last reply
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    • P Palash Mondal_

      Nope, `undefined` is not the answer. Since `undefined == undefined` returns true in console.

      M Offline
      M Offline
      Manfred Rudolf Bihy
      wrote on last edited by
      #4

      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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      • 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 :)

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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
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                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 !~

                  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
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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

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