From: Tsuyoshi Sawada <sawadatsuyoshi@gmail•com>
To: ruby-dev@ruby-lang.org (ruby developers list)
Subject: [ruby-dev:44962] [ruby-trunk - Feature #5735][Open] Extending the use of splat operator to when it is inside a hash
Date: Fri, 9 Dec 2011 13:31:03 +0900 [thread overview]
Message-ID: <redmine.issue-5735.20111209133102@ruby-lang.org> (raw)
Issue #5735 has been reported by Tsuyoshi Sawada.
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Feature #5735: Extending the use of splat operator to when it is inside a hash
http://redmine.ruby-lang.org/issues/5735
Author: Tsuyoshi Sawada
Status: Open
Priority: Normal
Assignee:
Category:
Target version:
Ruby convention of allowing omittion of the curly brackets for the last argument is convenient:
foo(arg1, arg2, 1 => :a, 2 => :b)
Sometimes, I want to pass a hash with some modifications. For example, suppose `h = {3 => :c, 4 => :d, 5 => :e}` is a hash already defined and that I want to add some key-value pairs as well as overwrite some values of `h`, such as {3 => :c, 4 => :f, 5 => :e, 6 => :g}, and pass that. The current convention only allows:
foo(arg1, arg2, h.merge(4 => :f, 6 => :g))
but it would be more convenient if a hash preceded by the splat operator is placed in a hash, it is interpreted as part of the hash, allowing notations like:
foo(arg1, arg2, *h, 4 => :f, 6 => :g)
or, if I want to overwrite the hash `{4 => :f, 6 => :g}` with `h`, then:
foo(arg1, arg2, 4 => :f, 6 => :g, *h)
Or besides the argument position, in general, usages like the following:
{3 => :h, *h, 4 => :f, 6 => :g}
This is an analogy from the splat operator used within an array:
[1, 2, *[4, 5, 6], 7, 8]
--
http://redmine.ruby-lang.org
next reply other threads:[~2011-12-09 4:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-09 4:31 Tsuyoshi Sawada [this message]
2012-03-28 15:57 ` [ruby-dev:45452] [ruby-trunk - Feature #5735][Feedback] Extending the use of splat operator to when it is inside a hash mame (Yusuke Endoh)
2012-11-20 12:57 ` [ruby-dev:46561] [ruby-trunk - Feature #5735] " mame (Yusuke Endoh)
2019-07-08 9:53 ` [ruby-dev:50811] [Ruby master Feature#5735] " sawadatsuyoshi
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