Feature #8951
closedPlease add a hash-to-hash alternative of the map method to Hash
Updated by fuadksd (Fuad Saud) about 11 years ago
Wow, I missed this a couple of days ago. Totally supported.
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Fuad Saud
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On Wednesday, September 25, 2013 at 1:05 AM, behrangsa (Behrang Saeedzadeh) wrote:
Issue #8951 has been reported by behrangsa (Behrang Saeedzadeh).
Feature #8951: Please add a hash-to-hash alternative of the map method to Hash
https://bugs.ruby-lang.org/issues/8951Author: behrangsa (Behrang Saeedzadeh)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:Please see this thread: https://twitter.com/behrangsa/status/382670159086776323
Updated by jamonholmgren (Jamon Holmgren) about 11 years ago
How about:
Hash#graph
or
Hash#rehash
Updated by fuadksd (Fuad Saud) about 11 years ago
#rehash is taken: http://www.ruby-doc.org/core-2.0.0/Hash.html#method-i-rehash
I was thinking about 'projection' or something, but everything feels just like an alternative to 'map' (#map, in my opinion, should return a hash).
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Fuad Saud
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On Wednesday, September 25, 2013 at 1:36 AM, jamonholmgren (Jamon Holmgren) wrote:
Issue #8951 has been updated by jamonholmgren (Jamon Holmgren).
How about:
Hash#graph
or
Hash#rehash
Feature #8951: Please add a hash-to-hash alternative of the map method to Hash
https://bugs.ruby-lang.org/issues/8951#change-41971Author: behrangsa (Behrang Saeedzadeh)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:Please see this thread: https://twitter.com/behrangsa/status/382670159086776323
Updated by Anonymous about 11 years ago
In my private library, I have 3 map-like methods defined on hash:
Hash#with_keys
Hash#with_values
Hash#modify
They work like this:
h = { a: 1, b: 2 }
h.with_keys do |k| k.to_s end #=> { "a"=>1, "b"=>2 }
h.with_values do |v| v.to_s end #=> { a: "1", b: "2" }
h.modify do |k, v| [k, "#{k}#{v}"] end #=> { a: "a1", b: "b2" }
plus their ! versions that modify the hash in place:¶
Hash#with_keys!, Hash#with_values!, Hash#modify!¶
But, this much being said, I am not sure whether this feature creep is such a good thing. Part of the fun in Ruby is that you are inventing your own libraries. If everything simple is already done in advance, it will be more "work" memorizing and less "fun" inventing :-))) Just randomly saying whatever comes to my mind, don't take me too seriously :-)
Updated by behrangsa (Behrang Saeedzadeh) about 11 years ago
How about having a construct similar to map.with_index
? For example map.to_has
or map.hashify
:
hash = { ... }
hash.map.to_hash do |e|
convert(e)
end
or
hash = { ... }
hash.map.hashify do |e|
convert(e)
end
Updated by fuadksd (Fuad Saud) almost 11 years ago
Hash#transform might also be a good name.
Updated by Ajedi32 (Ajedi32 W) over 10 years ago
I believe this is a duplicate of #6669
Updated by shyouhei (Shyouhei Urabe) over 8 years ago
- Related to Feature #12512: Import Hash#transform_values and its destructive version from ActiveSupport added
Updated by jeremyevans0 (Jeremy Evans) about 3 years ago
- Status changed from Open to Closed