interleave

interleave.clj

(defn interleave [arrays]
  (let [largest-length (apply max (map count arrays))]
    (->> (for [i (range largest-length)]
           (map #(nth % i nil) arrays))
         (flatten)
         (remove nil?))))

(interleave [[1 2 3] ["a" "b" "c"]])

interleave.py

def interleave(arrays):
    largest_array_length = len(max(arrays))
    result = []

    for i in range(largest_array_length):
        for array in arrays:
            if len(array) > i: result.append(array[i])
    return result

interleave([[1, 3, 5], ["a", "b", "c", "d", "e"]])

interleave.rb

def interleave(arrays)
  largest_length = arrays.map(&:length).max
  result = []
  0.upto(largest_length) do |i| 
    arrays.each { |a| result << a[i] if a.length > i } 
  end 
  result
end

interleave [[1, 2, 3], ["a", "b", "c"]]