sidazhang

# shortest_string is a method that takes an array of strings as its input
# and returns the shortest string
#
# +array+ is an array of strings
# shortest_string(array) should return the shortest string in +array+
#
# If +array+ is empty the method should return nil
def shortest_string(array)
    shortest = 0
        array.length.times do |i|

sidazhang

def longest_string(array)
    longest = 0
        array.length.times do |i|
            if  i == 0
                longest = array[i]
            elsif
                longest.length < array[i].length
                longest = array[i] 
            else
                longest

sidazhang

def factorial(n)
  results = 1
  n.times do |i|
  results = n * results
  n = n - 1
  end
results
end

sidazhang

def times_table(rows)
  # number of columns determined by the multiplier
  counter = 1
  results = ""
  multiples = 1
  
  rows.times do 
    
      rows.times do
          if rows >= counter

sidazhang

def reverse_words(array)

results = array.split(" ")
new_results = []    

  results.length.times do |i|
        new_results[i] = results[i].reverse
  end

return new_results.join(" ")

sidazhang

def separate_comma(number)
results = number.to_s.split("")
reverse_counter = results.length - 1
output = ""
comma_counter = 0
results.length.times do |i|
    output = results[reverse_counter] + output
    reverse_counter = reverse_counter - 1
    comma_counter = comma_counter + 1
        if comma_counter%3 == 0 && comma_counter/number.to_s.length != 1

sidazhang

def is_fibonacci?(i)
 array = [0,1]
 counter = 0
 while array.max < i
 array.push(array[counter]+array[counter+1])
 counter = counter + 1
 end
 array.include?(i)
end

sidazhang

def print_triangle(rows)
    rows.times do |i|
    puts "*"*(i+1)
    end



end

sidazhang

def median(array)
  mid_point = 0
  lower_mid_point = 0
  upper_mid_point = 0
  results = 0
    if array.length % 2 == 1
      mid_point = (array.length + 1  ) / 2 -1
      puts mid_point
      results =  array[mid_point]    

sidazhang

def mode(array)
hash = {}
maxnum = 0
resultsarray = []
    array.each do |i|
        if hash[i]
        
         hash[i] += 1