How to find the intersection of n arrays in Ruby?

Question

[1, 2, 3] & [2, 3, 4] gives us [2, 3] but how do you get the intersection of n arrays?

[[1, 2, 3], [2, 3, 4], [1, 3, 4]].something would give [3]

Looping with & works but there must be a better way.

Answer 1

Just & all arrays. Suppose you have 3 arrays.

a = [1,2,3]
b = [2,3,4]
c = [3,4,5]

a & b & c
=> [3]

Answer 2

[[1, 2, 3], [2, 3, 4], [1, 3, 4]].inject(:&) #=> [3]