Check if an array has any element in another array

Question

I have two arrays:

one = ["2cndb", "7bndb", "14accdb", "5ggdb"]
two = [["2cndb", "alive"], ["14accdb", "alive"], ["5ggdb", "not alive"]]

I want to check if each sub-array in two contains any element of one. When it does, I want to add an element "yes" to the sub-array, "no" otherwise.

My code is:

two.each do |item|
if (one.include?('item[0]'))
        item.push("yes")
    else
        item.push("no")
    end
end

and I get

two = [["2cndb", "alive", "no"], ["14accdb", "alive", "no"], ["5ggdb", "not alive", "no"]]

But "2cndb", "14accdb", "5ggdb" are present in one. Can You suggest where the problem is?

item[0] without quotes.

Ilya
– Ilya

2017-04-12 12:36:19 +00:00
Commented Apr 12, 2017 at 12:36 — Ilya
– Ilya, Commented Apr 12, 2017 at 12:36
'item[0]' is not item[0].

sawa
– sawa

2017-04-12 12:37:51 +00:00
Commented Apr 12, 2017 at 12:37 — sawa
– sawa, Commented Apr 12, 2017 at 12:37

Ilya · Accepted Answer · 2017-04-12 13:26:54Z

2

You should use just item[0] without quotes. But you said that you want to check all values in subarrays: in this case your solution will still wrong, so possible solution is:

one = ["2cndb", "7bndb", "14accdb", "5ggdb"]
two = [["2cndb", "alive"], ["14accdb", "alive"], 
       ["5ggdb", "not alive"], ["foo", "bar"]]
two.map { |e| e + [(one & e).empty? ? 'no'  : 'yes']}
#=> [["2cndb", "alive", "yes"], ["14accdb", "alive", "yes"],
#    ["5ggdb", "not alive", "yes"], ["foo", "bar", "no"]]

edited Apr 12, 2017 at 13:26

answered Apr 12, 2017 at 12:42

Ilya

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