Array inclusion checking with Ruby

Question

I need to check if array

a1 = [x, y]

is presented in array of arrays like

a2 = [ [a, b], [c,d], [e, f] ]

with Ruby 1.9. For example, if x == c and y == d then function must be True. I'v tried

a2.includes? a1 and a1 in a2 but both doesent work.

yep, i just checked and it works too, alongside with include? — user2296537
– user2296537, Commented Apr 18, 2013 at 19:25
I always keep the documentation for Array and Enumerable from Ruby Doc up in my browser at all times when I am coding. It is an invaluable source. — Charles Caldwell
– Charles Caldwell, Commented Apr 18, 2013 at 19:33

Arup Rakshit · Accepted Answer · 2013-04-18 19:29:41Z

5

see you used includes?, which should be include?.

a2 = [ [:a, :b], [:c,:d], [:e,:f] ]
a1 = [:a,:b] 
p a2.include? a1 #=>true

or you could do so as below:

a2 = [ [:a, :b], [:c,:d], [:e,:f] ]
a1 = [:a,:b] 
p a2.one? { |i| i == a1} #=>true

answered Apr 18, 2013 at 19:18

Arup Rakshit

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