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  3. The Weird and The Wonderful
  4. The best lambda expression I ever saw

The best lambda expression I ever saw

Scheduled Pinned Locked Moved The Weird and The Wonderful
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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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