Delete array elements according to certain criteria

Question

What is the best and way to do this: I have two arrays:

a=[['a','one'],['b','two'],['c','three'],['d','four']] 

and b=['two','three']

I want to remove nested arrays inside a that include elements in b to get the following:

 [['a','one']['d','four'] 

Thanks.

Answer 1

 a = [['a','one'],['b','two'],['c','three'],['d','four']] b = ['two','three'] a.delete_if { |x| b.include?(x.last) } pa # => [["a", "one"], ["d", "four"]] 

Answer 2

rassoc to the rescue!

  b.each {|el| a.delete(a.rassoc(el)) } 

Answer 3

 a=[['a','one'],['b','two'],['c','three'],['d','four']] b=['two','three'] result=a.reject { |e| b.include?(e.first) or b.include?(e.last) } # result => [["a", "one"], ["d", "four"]]