按特定条件删除数组元素

Question

什么是最好的方法:我有两个数组:

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

和 b=['two','three']

我想删除a包含元素的嵌套数组b,以获得:

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

谢谢.

Answer 1

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

a.delete_if { |x| b.include?(x.last) }

p a
# => [["a", "one"], ["d", "four"]]

Answer 2

rassoc救援!

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