Merge and interleave two arrays in Ruby

Question

I have the following code:

a = [\"Cat\", \"Dog\", \"Mouse\"]
s = [\"and\", \"&\"]

I want to merge the array s into array <

Answer 1

How about a more general solution that works even if the first array isn't the longest and accepts any number of arrays?

a = [
    ["and", "&"],
    ["Cat", "Dog", "Mouse"]
]

b = a.max_by(&:length)
a -= [b]
b.zip(*a).flatten.compact

 => ["Cat", "and", "Dog", "&", "Mouse"]