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Feature #17153
closedAdd Enumerable#compact_map
Status:
Closed
Assignee:
-
Target version:
-
Description
I often write code like this (map
, then compact
):
nums = [1, 2, 3, 4, 5]
nums.map { |n| n * 10 if n.even? }.compact
#=> [20, 40]
Or like this:
nums.select(&:even?).map { |n| n * 10 }
#=> [20, 40]
I think it would be very useful and simpler if we could do it by calling one method:
nums.compact_map { |n| n * 10 if n.even? }
#=> [20, 40]
How about introducing Enumerable#compact_map
?
Updated by sawa (Tsuyoshi Sawada) over 3 years ago
Hi Ito-san,
This is a duplicate of https://bugs.ruby-lang.org/issues/5663 and https://bugs.ruby-lang.org/issues/15323, and has been realized as Enumerable#filter_map
since Ruby 2.7.0.
[1, 2, 3, 4, 5].filter_map { |n| n * 10 if n.even? }
#=> [20, 40]
Updated by jnchito (Junichi Ito) over 3 years ago
Oops! I didn't notice that. Thank you for letting me know. Please close this.
sawa (Tsuyoshi Sawada) wrote in #note-1:
Hi Ito-san,
This is a duplicate of https://bugs.ruby-lang.org/issues/5663 and https://bugs.ruby-lang.org/issues/15323, and has been realized as
Enumerable#filter_map
since Ruby 2.7.0.[1, 2, 3, 4, 5].filter_map { |n| n * 10 if n.even? } #=> [20, 40]
Updated by jeremyevans0 (Jeremy Evans) over 3 years ago
- Status changed from Open to Closed
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