[Ironruby-core] question on some code from ironrubymvc

Tomas Matousek Tomas.Matousek at microsoft.com
Thu Jan 29 18:32:28 EST 2009

_ and __ are just normal local variables (parameters) scoped to the lambda.


From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of Andrew Peters
Sent: Thursday, January 29, 2009 2:06 PM
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] question on some code from ironrubymvc

Cool! I didn't know you could do this.

It's just a placeholder when you don't care about that arg. Very functional.
On Thu, Jan 29, 2009 at 1:43 PM, Ivan Porto Carrero <ivan at flanders.co.nz<mailto:ivan at flanders.co.nz>> wrote:

While working on the code for a ironrubymvc i came across the following code

controllerRubyClass.EnumerateMethods((_, symbolId, __) =>
                                                             if (String.Equals(symbolId, actionName,
                                                                 controllerRubyMethodName = symbolId;
                                                                 return true;
                                                             return false;

The tidbit I find interesting is the _ and the __ in the lambda. Is that an equivalent for null or does it something else?
Met vriendelijke groeten - Best regards - Salutations
Ivan Porto Carrero
GSM: +32.486.787.582
Blog: http://flanders.co.nz<http://flanders.co.nz/>
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