Equivalent to Array.some in ruby/rails

Question

I would like to do the equivalent of Array.some in rails.

Here's an example applied to my usecase which is kind of a more complex include? (i want to apply this to *args):

ary = [:a, :b, :c, d: :x, e: :y] # => [:a, :b, :c, { :d => :x, :e => :y }]
search = :e
contained = ary.some { |x|
  x == search || x.try(:key?, search)
} # => true
assert contained, "We should have found #{search}"

I could do this with ary.map but that would mean go through the whole array and then again test it's contents. I could also use ary.drop_while and verify if it returns an empty array or not but again, i would need to test the result. I've also seen ary.bsearch but there are some strange limitations i don't quite understand about the order of elements.

Have i missed something ? Isn't there an easy way to do that ? i'm using ruby2 and rails 4 (edge).

I added the output as a comment in the code. ary.some should ouput true in that usecase — Crystark
– Crystark, Commented Mar 26, 2013 at 16:48

tokland · Accepted Answer · 2023-11-13 19:03:08Z

31

Javascript Array.prototype.some is equivalent to Ruby Enumerable#any?.

["1", "2", "3"].any? { |x| x.to_i == 2 } #=> true

edited Nov 13, 2023 at 19:03

answered Mar 26, 2013 at 16:49

tokland

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1 Comment

Crystark Over a year ago

Exactly what i was looking for. I didn't knew of Enumerable ! Thanks alot !

mr rogers · Accepted Answer · 2013-11-20 17:33:10Z

0

If you are really looking for some? you might want something like this

module Enumerable
  def some?
    self.any? && !self.all?
  end
end

This will give you true only if some of the elements are set but not all.

Check out the snippet here https://coderwall.com/p/wcgj2w

answered Nov 20, 2013 at 17:33

mr rogers

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1 Comment

tonestrike Over a year ago

[true].some((e) => e) is true. Some does not logically or in JS exclude the possibility of all being true.

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