From: naruse@...
Date: 2016-01-20T13:56:17+00:00
Subject: [ruby-core:72979] [Ruby trunk - Feature #11999] MatchData#to_h to get a Hash from named captures

Issue #11999 has been updated by Yui NARUSE.


Yukihiro Matsumoto wrote:
> I don't think `to_h` is appropriate, because `MatchData` is not always able to convert to Hash/Map.
> Is there any name candidate?

I feel it can always convert to Hash because even if it doesn't use named captures, the numbering is 1-origin.

```
irb(main):001:0> /(a)(b)(c)/.match("abc")
=> #<MatchData "abc" 1:"a" 2:"b" 3:"c">
irb(main):002:0> /(a)(b)(c)/.match("abc").to_h
=> {1=>"a", 2=>"b", 3=>"c"}
```

----------------------------------------
Feature #11999: MatchData#to_h to get a Hash from named captures
https://bugs.ruby-lang.org/issues/11999#change-56199

* Author: sorah Shota Fukumori
* Status: Open
* Priority: Normal
* Assignee: 
----------------------------------------
~~~
class MatchData
  def to_h
    self.names.map { |n| [n, self[n]] }.to_h
  end
end

p '12'.match(/(?<a>.)(?<b>.)(?<c>.)?/).to_h #=> {"a"=>"1", "b"=>"2", "c"=>nil}
~~~

Sometimes I want to get a Hash from named capture, but currently I have to use #names + #captures. How about adding MatchData#to_h for convenience way?



---Files--------------------------------
11999.diff (2.77 KB)


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