Feature #17140
openMerge Enumerable#grep(_v) with Enumerable#select/reject
Description
In recent versions of Ruby we've gotten new behavior of some Enumerable methods like any?, all?, none?, one?, and others to support a single argument pattern that responds to ===
. This is very powerful, and very useful.
Currently Enumerable has grep
and grep_v
which allow this as a way to filter lists.
These names require some understanding of Unix to be familiar with, but naming aside, I feel it may make sense to implement ===
pattern arguments in Enumerable#select
and Enumerable#reject
as with the above.
Proposed Syntax:
list_of_numbers.select(1..10)
words.reject({ 'and', 'the', 'of' })
I believe this would help with readability and would simplify syntax options by unifying on this standard.
My concern is that Enumerable#find
already takes a single argument, ifnone
, and may not be able to implement this behavior. I would be curious to see how many use ifnone
but feel this would be more critically breaking to do.
Updated by duerst (Martin Dürst) about 4 years ago
I guess I understand the first example. Just to make sure:
[-3, 4, 0, 8.5, 20, 5].select(1..10) #=> [4, 8.5, 5]
But for the second example, I don't understand { 'and', 'the', 'of' }
. Is that supposed to be an array, or what?
Updated by marcandre (Marc-Andre Lafortune) about 4 years ago
I imagine that Set['and', 'the', 'of']
was meant.
Updated by matz (Yukihiro Matsumoto) about 4 years ago
Enhancing select
and reject
seems a good idea.
Matz.
Updated by nobu (Nobuyoshi Nakada) about 4 years ago
I made select
parts.
https://github.com/nobu/ruby/pull/new/feature/17140-enum_select
Updated by baweaver (Brandon Weaver) over 3 years ago
Would this feature still be of interest?