barbchoy

# Write a method that takes in a string. Your method should return the
# most common letter in the array, and a count of how many times it
# appears.
#
# Difficulty: medium.

def most_common_letter(string)
  i=0
  j=0
  frequency=0

barbchoy

# Write a method that takes an array of numbers in. Your method should
# return the third greatest number in the array. You may assume that
# the array has at least three numbers in it.
#
# Difficulty: medium.

def third_greatest(nums)
  sorted_nums=[]
  new_nums=[]
  i=0

barbchoy

# Write a method that takes an array of numbers in. Your method should
# return the third greatest number in the array. You may assume that
# the array has at least three numbers in it.
#
# Difficulty: medium.

def third_greatest(nums)
  sorted_nums=nums.sort

  return sorted_nums[nums.length-3]

barbchoy

# Write a method that takes in a number and returns true if it is a
# power of 2. Otherwise, return false.
#
# You may want to use the `%` modulo operation. `5 % 2` returns the
# remainder when dividing 5 by 2; therefore, `5 % 2 == 1`. In the case
# of `6 % 2`, since 2 evenly divides 6 with no remainder, `6 % 2 == 0`.
#
# Difficulty: medium.

def is_power_of_two?(num)

barbchoy

# Write a method that takes an array of numbers. If a pair of numbers
# in the array sums to zero, return the positions of those two numbers.
# If no pair of numbers sums to zero, return `nil`.
#
# Difficulty: medium.

def two_sum(nums)
  pos=[]
  i=0

barbchoy

# Write a method that takes a string in and returns true if the letter
# "z" appears within three letters **after** an "a". You may assume
# that the string contains only lowercase letters.
#
# Difficulty: medium.

def nearby_az(string)
  i=0
  a_pos=0
  while i<string.length

barbchoy

# Write a method that takes a string and returns true if it is a
# palindrome. A palindrome is a string that is the same whether written
# backward or forward. Assume that there are no spaces; only lowercase
# letters will be given.
#
# Difficulty: easy.

def palindrome?(string)
  i=0
  palindrome_or_no=true

barbchoy

# Write a method that takes a string and returns the number of vowels
# in the string. You may assume that all the letters are lower cased.
# You can treat "y" as a consonant.
#
# Difficulty: easy.

def count_vowels(string)
  i=0

  num_vowels=0

barbchoy

# Write a method that will take in a number of minutes, and returns a
# string that formats the number into `hours:minutes`.
#
# Difficulty: easy.

def time_conversion(minutes)
  hour=0
  mins=0
  string_hr_mins=""
  hour=minutes/60

barbchoy

# Write a method that takes in an integer `num` and returns the sum of
# all integers between zero and num, up to and including `num`.
#
# Difficulty: easy.

def sum_nums(num)
  sum=0
  i=0
  while i<num+1
  sum=sum+i