Nested / Multidimensional Arrays

nested_arrays.rb

things = [[1,2,3], ["red", "blue"]] #=> create an array of arrays.


puts things[0][1] #=> Print out 2. The array with numbers is at index zero in 'things' and 2 is at index one in that sub-array.

things.each do |sub_array| #sub_array is each element of the 'things' array.
  sub_array.each do |item| #The each method is called on the sub-arrays. First [1,2,3] then [1,2,3]
    puts item
  end
end

# Then, we iterate through the things array and use the variable sub_array for the array containing numbers
# and the array containing colors.
# Next, we iterate through each sub_array and puts out each item.

#=>
1
2
3
red
blue