Ruby相当于grep -v

问题描述

这是我一直在做的：

  my_array.reject {| elem | elem =〜/ regex /} .each {...} 
  

我觉得这有点儿笨拙的，但我还没有发现任何内建的东西可以让我将它改为 my_array.grepv / regex / {...}

是否有这样的函数？

解决方案

您知道 Symbol＃to_proc 有助于链接？您可以对正则表达式执行相同的操作：

  class正则表达式
 def to_proc 
 Proc.new {|串|字符串=〜self} 
结束
结束
 
 [Ruby，perl，Perl，PERL]。reject（& / perl / i） 
 => [Ruby] 
  

但你可能不应该。 Grep不仅适用于正则表达式 - 您可以像下面这样使用它：

  [1,2，three， 4] .grep（Fixnum）
  

如果你想grep -v，你会实现 Class＃to_proc ，这听起来不对。

This is what I've been doing instead:

my_array.reject { |elem| elem =~ /regex/ }.each { ... }

I feel like this is a little unwieldy, but I haven't found anything built in that would let me change it to my_array.grepv /regex/ { ... }

Is there such a function?

解决方案

You know how Symbol#to_proc helps with chaining? You can do the same with regular expressions:

class Regexp
  def to_proc
    Proc.new {|string| string =~ self}
  end
end

["Ruby", "perl", "Perl", "PERL"].reject(&/perl/i)
=> ["Ruby"]

But you probably shouldn't. Grep doesn't just work with regular expressions - you can use it like the following

[1,2, "three", 4].grep(Fixnum)

and if you wanted to grep -v that, you'd have to implement Class#to_proc, which sounds wrong.

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