The Weird and The Wonderful

The Weird and The Wonderful forum is a place to post Coding Horrors, Worst Practices, and the occasional flash of brilliance.

We all come across code that simply boggles the mind. Lazy kludges, embarrassing mistakes, horrid workarounds and developers just not quite getting it. And then somedays we come across - or write - the truly sublime.

Post your Best, your worst, and your most interesting. But please - no programming questions . This forum is purely for amusement and discussions on code snippets. All actual programming questions will be removed.

The best lambda expression I ever saw

Thomas Daniels2-Feb-13 5:55

Thomas Daniels

2-Feb-13 5:55

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

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

ASP

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

ProgramFOX

Re: The best lambda expression I ever saw

Brisingr Aerowing2-Feb-13 7:32

Brisingr Aerowing

2-Feb-13 7:32

And the best part is that actually works!

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

2.0.82.7292 SP6a

Re: The best lambda expression I ever saw

joe_j4-Feb-13 20:00

joe_j

4-Feb-13 20:00

does that even work?

Re: The best lambda expression I ever saw

Thomas Daniels5-Feb-13 6:37

Thomas Daniels

5-Feb-13 6:37

Yes.

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

ASP

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

ProgramFOX

Re: The best lambda expression I ever saw

Robert Rohde4-Feb-13 22:10

Robert Rohde

4-Feb-13 22:10

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

Re: The best lambda expression I ever saw

Brisingr Aerowing5-Feb-13 6:58

Brisingr Aerowing

5-Feb-13 6:58

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.

2.0.82.7292 SP6a

Re: The best lambda expression I ever saw

Remi BOURGAREL6-Feb-13 21:28

Remi BOURGAREL

6-Feb-13 21:28

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

Re: The best lambda expression I ever saw

SortaCore6-Feb-13 22:04

SortaCore

6-Feb-13 22:04

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

C++

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

... but I suspect he was trolling.

Re: The best lambda expression I ever saw

peterchen7-Feb-13 2:09

peterchen

7-Feb-13 2:09

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

ORDER BY what user wants

Re: The best lambda expression I ever saw

phwitti7-Feb-13 7:08

phwitti

7-Feb-13 7:08

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^^)

Re: The best lambda expression I ever saw

RafagaX7-Feb-13 5:37

RafagaX

7-Feb-13 5:37

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

Re: The best lambda expression I ever saw

Gates VP7-Feb-13 8:05

Gates VP

7-Feb-13 8:05

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.

Re: The best lambda expression I ever saw

Brisingr Aerowing23-Feb-13 8:59

Brisingr Aerowing

23-Feb-13 8:59

As well as the actual lambda Greek letter.

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

2.0.82.7292 SP6a

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