Rails array union?

Question

Ruby on Rails

Hello, do not tell me how best to combine several arrays. Here's how the example

f = [ 'f1', 'f2', 'f3' ]
 a = [ 'a1', 'a2', 'a3' ]
result =  a.map{ | v | f.map{ |v2| [v, v2] } }
#=> [, , ]

and you need the result to be a two-dimensional array

Answer 1

a.product(f)

Answer 2

Have you tried the zip method?

Answer 3

I made it with such a crutch, but maybe there is a better option?

d = []
a.each{ | v | f.each{ |v2| d<<[v, v2] } }