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  4. The best lambda expression I ever saw

The best lambda expression I ever saw

Scheduled Pinned Locked Moved The Weird and The Wonderful
linqfunctional
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  • T Thomas Daniels

    var someVar = someList.SelectMany(λ => λ);

    In some cases, my signature will be longer than my message...

    <em style="color:red"> <b>ProgramFOX</b></em>

    ProgramFOX

    B Offline
    B Offline
    Brisingr Aerowing
    wrote on last edited by
    #2

    :laugh: And the best part is that actually works!

    Bob Dole

    The internet is a great way to get on the net.

    :doh: 2.0.82.7292 SP6a

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    • T Thomas Daniels

      var someVar = someList.SelectMany(λ => λ);

      In some cases, my signature will be longer than my message...

      <em style="color:red"> <b>ProgramFOX</b></em>

      ProgramFOX

      J Offline
      J Offline
      joe_j
      wrote on last edited by
      #3

      does that even work?

      T 1 Reply Last reply
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      • T Thomas Daniels

        var someVar = someList.SelectMany(λ => λ);

        In some cases, my signature will be longer than my message...

        <em style="color:red"> <b>ProgramFOX</b></em>

        ProgramFOX

        R Offline
        R Offline
        Robert Rohde
        wrote on last edited by
        #4

        Well that makes sense if someList is a list of objects which implement IEnumerable (like List<List<int>>. A bit weird but no horror.

        B R 2 Replies Last reply
        0
        • J joe_j

          does that even work?

          T Offline
          T Offline
          Thomas Daniels
          wrote on last edited by
          #5

          Yes.

          In some cases, my signature will be longer than my message...

          <em style="color:red"> <b>ProgramFOX</b></em>

          ProgramFOX

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          • R Robert Rohde

            Well that makes sense if someList is a list of objects which implement IEnumerable (like List<List<int>>. A bit weird but no horror.

            B Offline
            B Offline
            Brisingr Aerowing
            wrote on last edited by
            #6

            Which is why this forum is called "The Weird and The Wonderful"!!

            Bob Dole

            The internet is a great way to get on the net.

            :doh: 2.0.82.7292 SP6a

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            • R Robert Rohde

              Well that makes sense if someList is a list of objects which implement IEnumerable (like List<List<int>>. A bit weird but no horror.

              R Offline
              R Offline
              Remi BOURGAREL
              wrote on last edited by
              #7

              It's not even weird, if you want to flat a list of lists then that's the best way to do it.

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              • T Thomas Daniels

                var someVar = someList.SelectMany(λ => λ);

                In some cases, my signature will be longer than my message...

                <em style="color:red"> <b>ProgramFOX</b></em>

                ProgramFOX

                S Offline
                S Offline
                SortaCore
                wrote on last edited by
                #8

                I think one posted in the chatroom a coupla days ago had C++11...

                [](){[](){}();}();

                ... but I suspect he was trolling.

                P 1 Reply Last reply
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                • S SortaCore

                  I think one posted in the chatroom a coupla days ago had C++11...

                  [](){[](){}();}();

                  ... but I suspect he was trolling.

                  P Offline
                  P Offline
                  peterchen
                  wrote on last edited by
                  #9

                  The great thing about C++ is: you can never be sure.

                  ORDER BY what user wants

                  P 1 Reply Last reply
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                  • T Thomas Daniels

                    var someVar = someList.SelectMany(λ => λ);

                    In some cases, my signature will be longer than my message...

                    <em style="color:red"> <b>ProgramFOX</b></em>

                    ProgramFOX

                    R Offline
                    R Offline
                    RafagaX
                    wrote on last edited by
                    #10

                    :omg:

                    CEO at: - Rafaga Systems - Para Facturas - Modern Components for the moment...

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                    • P peterchen

                      The great thing about C++ is: you can never be sure.

                      ORDER BY what user wants

                      P Offline
                      P Offline
                      phwitti
                      wrote on last edited by
                      #11

                      xD .. If i'm not mistaken, that is just an empty lambda nested inside another one ... I wonder if one could go on and on like that. -- But in the end it would do nothing (besides probably a stack overflow, if you take it too far^^)

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                      • T Thomas Daniels

                        var someVar = someList.SelectMany(λ => λ);

                        In some cases, my signature will be longer than my message...

                        <em style="color:red"> <b>ProgramFOX</b></em>

                        ProgramFOX

                        G Offline
                        G Offline
                        Gates VP
                        wrote on last edited by
                        #12

                        I think I have to classify this as "wonderful", because it's honestly pretty common. The simplest case of SelectMany is to flatten a "List of List of Objects" into a "List of Objects". And that's exactly what this lambda does. I guess the "weird" here is that SelectMany is doing some extra magic merging the lists.

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                        • G Gates VP

                          I think I have to classify this as "wonderful", because it's honestly pretty common. The simplest case of SelectMany is to flatten a "List of List of Objects" into a "List of Objects". And that's exactly what this lambda does. I guess the "weird" here is that SelectMany is doing some extra magic merging the lists.

                          B Offline
                          B Offline
                          Brisingr Aerowing
                          wrote on last edited by
                          #13

                          As well as the actual lambda Greek letter.

                          Bob Dole

                          The internet is a great way to get on the net.

                          :doh: 2.0.82.7292 SP6a

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