I have multiple arrays, lets say 4 for example:
a = ["a", "b", "c" ]
b = [1, 2, 3, 4]
c = ["xx", "yy"]
d = ["abc"]
I'd like to "progressively" do product of arrays in an iterative fashion, something like this
a.product(b)
a.product(b, c)
a.product(b, c, d)
I want to be able to do in a scalable fashion where the array count varies and get array product upto arr0.product(arr1, arr2, arr3.......arrn).Could someone please help figure out how to do this in Ruby.
Thanks in advance!
a = ["a", "b", "c" ]
b = [1, 2, 3, 4]
c = ["xx", "yy"]
d = ["abc"]
ars = [b,c,d]
p ars.each_index.flat_map{|i| a.product(*ars[0..i])}
You could abstract it like this:
def prog_product(arrs)
x, *xs = arrs
(1..xs.count).map(&xs.method(:take)).map do |args|
x.product(*args)
end
end
This will return an array of the progressive products, such as:
[a1.product(a2), ..., a1.product(a2, ..., an)]
In your case, prog_products(a, b, c, d) would return [a.product(b), a.product(b, c), a.product(b, c, d)]. If for some reason you wanted to merge all the products into one big array, you may call .flatten(1) on the result.
