From: halogenandtoast@...
Date: 2016-09-02T13:11:21+00:00
Subject: [ruby-core:77129] [Ruby trunk Feature#12719] `Struct#|` for partial	updates

Issue #12719 has been updated by Matthew Mongeau.

File struct_merge.patch added

As an alternative since the `|` syntax might get shot down. Here's a patch adding a merge function instead:

~~~ ruby
Point = Struct.new(:x, :y)

p = Point.new(1, 2)
p2 = p.merge(y: 4)
p3 = p2.merge(x: 10)

puts p.inspect # => #<struct Point x=1, y=2>
puts p2.inspect # => #<struct Point x=1, y=4>
puts p3.inspect # => #<struct Point x=10, y=4>
~~~


----------------------------------------
Feature #12719: `Struct#|` for partial updates
https://bugs.ruby-lang.org/issues/12719#change-60347

* Author: Matthew Mongeau
* Status: Open
* 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 | { y: 4 }
p3 = p2 | { x: 10 }

puts p.inspect # => #<struct Point x=1, y=2>
puts p2.inspect # => #<struct Point x=1, y=4>
puts p3.inspect # => #<struct Point x=10, y=4>
~~~


---Files--------------------------------
struct_update.patch (2.04 KB)
struct_merge.patch (2.04 KB)


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