From: matz@...
Date: 2016-11-25T08:59:55+00:00
Subject: [ruby-core:78337] [Ruby trunk Feature#12719][Feedback] `Struct#merge` for partial updates

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: 
----------------------------------------
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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