Search if a value exists in a Ruby Array

Question

I currently have this:

cart = [{"40"=>[{"size"=>"1", "count"=>1, "variation"=>nil, "style"=>"3"}]}, {"40"=>[{"size"=>"2", "count"=>1, "variation"=>nil, "style"=>"3"}]}]

How do I search this array and find out if "40" exists?

Exists in what way? Technically speaking, '40' is not a member of your array. — Mladen Jablanović
– Mladen Jablanović, Commented May 16, 2011 at 15:57
cart[0].first[0] == "40" now build that into a cart.each block. I guess he's referring to the string-key "40". — Michael De Silva
– Michael De Silva, Commented May 16, 2011 at 15:58

tokland · Accepted Answer · 2017-05-31 18:24:32Z

9

item_in_cart = cart.any? { |item| item.has_key?("40") } 
#=> true / false

answered May 16, 2011 at 16:33

tokland

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Comments

Doug R · Accepted Answer · 2011-05-16 16:03:34Z

7

If you want to find if "40" is a key in any of your array items, you can do:

cart.detect{|i| i.has_key?("40")}

answered May 16, 2011 at 16:03

Doug R

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Michael De Silva · Accepted Answer · 2011-05-16 16:37:20Z

2

You can also do

cart.each do |c|
  if c.first[0] == "40"
    match = true
  end
end

or far cleaner

match = cart.any? {|c| c.first[0] == "40" }

answered May 16, 2011 at 16:25

Michael De Silva

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