From: "Eregon (Benoit Daloze)" <redmine@...>
Date: 2012-03-29T21:57:30+09:00
Subject: [ruby-core:43853] [ruby-trunk - Feature #6150] add Enumerable#grep_v


Issue #6150 has been updated by Eregon (Benoit Daloze).


Rodrigo Rosenfeld Rosas wrote:
> I'm sorry, Benoit, but I didn't get it. It seems to me that they do permit. What did you mean by "they do not permit this"?

> Of course, after Ruby support named parameters this could be acceptable too and I would always use it by passing the named parameter instead of just "true".

With keyword arguments, you have to pass the keyword: `grep(matcher, invert: true)`, `grep(matcher, true)` is invalid (wrong number of arguments atm).
----------------------------------------
Feature #6150: add Enumerable#grep_v
https://bugs.ruby-lang.org/issues/6150#change-25362

Author: sunaku (Suraj Kurapati)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Please add a grep_v() method to Enumerable that behaves like the opposite of grep().

For example, if Enumerable#grep() was implemented like this:

module Enumerable
  def grep pattern
    select {|x| pattern =~ x }
  end
end

then Enumerable#grep_v() would be implemented like this (select becomes reject):

module Enumerable
  def grep_v pattern
    reject {|x| pattern =~ x }
  end
end


The method name "grep_v" comes from the "-v" option passed to grep(1).

Thanks for your consideration.


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