How do I filter elements in an array?

Question

Sample Array:

x = [1,2,3,4,2,2,2]

Filter:

y = [2,4,7,9]

Desired output:

result = [2,4,2,2,2]

I tried:

result = (x & y)

but this gives me [4,2].

How do I get: result = [2,4,2,2,2]?

Answer 1

How about:

x - (x - y)
#=> [2, 4, 2, 2, 2]