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

Interleave 2D array of any size

arr = [["Cat", "Dog", "Mouse"],
 ["and", "&"],
 ["hello", "there", "you", "boo", "zoo"]]

max_count = arr.map(&:count).max
max_count.times.map{|i| arr.map{|a| a[i]}}.flatten.compact

#=> ["Cat", "and", "hello", "Dog", "&", "there", "Mouse", "you", "boo", "zoo"]