[ruby-core:78337] [Ruby trunk Feature#12719][Feedback] `Struct#merge` for partial updates
From:
matz@...
Date:
2016-11-25 08:59:55 UTC
List:
ruby-core #78337
Issue #12719 has been updated by Yukihiro Matsumoto.
Status changed from Open to Feedback
I want to see a real-world use-case for the feature.
In addition, I don't think the name `merge` is the best for the functionality.
Matz.
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Feature #12719: `Struct#merge` for partial updates
https://bugs.ruby-lang.org/issues/12719#change-61701
* Author: Matthew Mongeau
* Status: Feedback
* Priority: Normal
* Assignee:
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Other languages have operators for performing partial updates on maps. I feel like Struct could be more useful if it provided an easy way of performing partial (or full) updates.
After the change you can do the following:
~~~ ruby
Point = Struct.new(:x, :y)
p = Point.new(1, 2)
p2 = p.merge(y: 4)
p3 = p2.merge(x: 10)
p.inspect # => #<struct Point x=1, y=2>
p2.inspect # => #<struct Point x=1, y=4>
p3.inspect # => #<struct Point x=10, y=4>
p.merge!("x" => 9)
p.inspect # => #<struct Point x=9, y=2>
~~~
---Files--------------------------------
struct_merge.patch (2.93 KB)
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