# Lesson 11

# Arrays Lesson. In this lesson, you
# will learn about arrays (ordered
# lists).

# General Instructions:
#
# This lesson contains one example and
# one exercise (A).
#
# To listen to an example, change "comment"
# to "uncomment" on the "comment do" line,
# then click the "Run" menu command at the
# top of the Sonic Pi editor window.
# When you are done with the example, turn
# it off by changing "uncomment" back to
# "comment," and move on to the next section
# of the lesson.
#

# Arrays are ordered collections (lists)
# of values or objects. An object or value
# in an array is referenced by an
# index indicating it's position in the array.
# In Sonic Pi, the first value in an array has
# an index = 0.

# Example 1: Array.

comment do
  major_scale_array = [:C4, :D4, :E4, :F4,
                       :G4, :A4, :B4, :C5]
  count = major_scale_array.length
  index = 0
  count.times do
    note = major_scale_array[index]
    play note
    sleep 1
    index += 1
  end
end

# Exercise A
# Change the name and contents of the
# major_scale_array in Example 1
# to the following:

#   1) minor_scale_array (natural minor)
#   2) major_triad_array (root, 3rd, 5th);
#      use a # comment symbol to comment out
#      the sleep 1 command. What happens?
#   3) chromatic_scale_array (from :C4 to :G4)