AndrewGuard

# Currently works with seven letter words only

phone_number = "18002435377"

last_seven_digits = phone_number.to_s[-7..-1].split(//).map(&:to_i)

def return_letters(digit)
  hash_map = {2 => ["a", "b", "c"],
    3 => ["d", "e", "f"],
    4 => ["g", "h", "i"],

AndrewGuard

def binary_search(num, array, offset = 0)
  mid = (array.length - 1)/2

  if array[mid] == num
    return mid + offset
  end

  if array[mid] < num
    offset += mid + 1
    binary_search(num, array[(mid + 1).. -1], offset)

AndrewGuard

def primes(n)
  prime_factors = []

  until n == 1
    2.upto(n) do |factor|
      if n % factor == 0
        prime_factors << factor
        n /= factor
      end
    end

AndrewGuard

def fac(n)
  if n < 2
    1
  else
    n * fac(n-1)
  end
end

def factorial(n)
  sum = 1

AndrewGuard

require 'benchmark'

def fib_it(n)
  fib_nums = [0, 1]
  iterate = n-1
  iterate.times do
    num = fib_nums[-2] + fib_nums[-1]
    fib_nums << num
  end
  p fib_nums[-1]

AndrewGuard

# Returns an array of all matching indeces
list_of_items = [8,1,1,1,2,3,4,5,6,7,8,8,8,8]

def linear_search(target_item, list)
  items_index = []
  counter = 0
  list.each do |t|
    if t == target_item
      items_index << counter
    end

AndrewGuard

# Only returns the index of the first match
list_of_items = [8,1,1,1,2,3,4,5,6,7,8,8,8,8]

def linear_search(target_item, list)
  counter = 0
  list.each do |t|
    if t == target_item
      puts counter
      break
    end

AndrewGuard

# Destructive method

list_of_items = %w(a b c d e f g h i j k l m n o p q r s t u v w x y z)

def shuffle(list_of_items)
  randomly_ordered_list = []

  until list_of_items.length == 0
    random_number = rand(list_of_items.length)
    removed_item = list_of_items.slice!(random_number)

AndrewGuard

puts "Enter a word: "
word = gets.chomp

def pig_latinify(word)
  if word.start_with?('a', 'e', 'i', 'o', 'u')
    word << 'way'
  else
    sorted_letters = word.chars.to_a
    until sorted_letters[0] == 'a' || sorted_letters[0] == 'e' || sorted_letters[0] == 'i' || sorted_letters[0] == 'o' || sorted_letters[0] == 'u'

AndrewGuard

def to_roman(num)
  roman_numerals = {
    1000   => "M",
    900    => "CM",
    500    => "D",
    400    => "CD",
    100    => "C",
    90     => "XC",
    50     => "L",
    40     => "XL",