TECH603 Day 3 Warmup

warmup.rb

# 1. Create a `day_3` directory under the course directory.

# 2. Save this file under the new folder as `warmup.rb`.

# 3. Assign any string value to a variable.
string = "i hope i do well in class today"

# 4. Assign any whole number to a variable.
b = 42

# 5. Assign any decimal number to a variable. 
c = 1.6

# 6. Add each of the previous variables to a collection.
collection = [string, b, c]

# 7. Output the number of items in the collection.
puts collection.count

# 8. Iterate through the collection and output each item.
collection.each do |fuzzy|
  puts fuzzy
end

for fuzzy in collection
  puts fuzzy
end

# 9. Create a dictionary with your name, birth month, and birth day.
dictionary = {
  "name" => "Phil",
  "birth_month" => "January",
  "birth_day" => 1
}

# 10. Using the dictionary from the previous step, output the following message:
#       My name is _ and my birthday is on _.
puts "My name is #{dictionary["name"]} and my birthday is on #{dictionary["birth_month"]} #{dictionary["birth_day"]}."

# 11. Add the dictionary from step 10 to the collection of items from step 6.
collection.push(dictionary)
puts collection.to_s

# 12. Create a function which returns an "ordinal indicator" for a number.
# 
#     In written languages, an ordinal indicator is a character, or group of 
#     characters, following a numeral denoting that it is an ordinal number, 
#     rather than a cardinal number.
#     In English orthography, this corresponds to the suffixes -st, -nd, -rd,
#     -th in written ordinals represented as 1st, 2nd, 3rd, 4th, etc.
def ordinal_indicator(number)
  return number if number.to_s != number.to_i.to_s

  last_two = number.to_s[-2..-1]
  return "#{number}th" if ["11", "12", "13"].include?(last_two)

  case number.to_s[-1]
  when "1" then "#{number}st"
  when "2" then "#{number}nd"
  when "3" then "#{number}rd"
  else          "#{number}th"
  end
end

[nil, "one", 23.5, 1, 2, 3, 4, 5, 11, 21, 211, 212, 221, 223, 222, 1000].each do |number|
  puts ordinal_indicator(number).inspect
end

warmup_early_versions.rb

# early version of our function
def ordinal_indicator(number)
  # "1" => "1st"
  # "2" => "2nd"
  if number.to_i == 1
    return "1st"
  elsif number.to_i == 2
    return "2nd"
  end
end

# in-progress version of our function
def ordinal_indicator(number)
  # "1" => "1st"
  # "2" => "2nd"
  # int = number.to_i
  last_number = number.to_s[-1]
  last_two = number.to_s[-2..-1]

  if ["11", "12", "13"].include?(last_two)
    return "#{number}th"
  elsif last_number == "1"
    return "#{number}st"
  elsif last_number == "2"
    return "#{number}nd"
  elsif last_number == "3"
    return "#{number}rd"
  else
    return "#{number}th"
  end
end