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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
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

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

    does that even work?

    T 1 Reply Last reply
    0
    • 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
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      • 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...

                  1 Reply Last reply
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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^^)

                    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

                      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.

                      B 1 Reply Last reply
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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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