jkaihsu

def add(x,y)
  x + y
end

def subtract(x,y)
  x - y
end

def multiply(x,y)
  x * y

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def mode(array)
  mode = array.inject(Hash.new(0)) { |h,v| h[v] = h[v] + 1; h}
  mode.select{ |h,v| v == mode.values.max }.keys
end

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def longest_string(array)

  if array.empty?
    nil
  else 
    long_string = array.group_by(&:size).max.last
    long_string[0]  
    end
end

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def reverse_words(str)
  words = str.split(' ')
  reverse_str = []

  words.length.times do |i|
    reverse_str[i] = words[i].reverse
  end
    

  return reverse_str.join(" ")

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def separate_comma(number)
  number.to_s.reverse.gsub(/(\d{3})(?=\d)/, '\\1,').reverse
end

jkaihsu

class Array
  def pad!(min_size, value = nil)
    x = min_size - self.count
    x.times {self << value}
    self  
  end

  def pad(min_size, value = nil)
    self.clone.pad!(min_size, value)
  end

jkaihsu

def count_between(array, lower_bound, upper_bound)
    array.count{|x| x >= lower_bound && x <= upper_bound}
end

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def print_triangle(rows)
  for j in 1..rows do
     for i in 1..j do
         print "*" * 1
     end
     puts
    end
end

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class Sudoku

  def initialize(string)
    string_of_array = string.split("")
    @board = Array.new(9) {string_of_array.shift(9)}
  end


  def solve!
    first_empty = find_empty_cell

jkaihsu

GIT & GITHUB

Index

1. New

1. Setup
   • Creating a new, local-only repo
   • Creating a github-based repo
   • Moving a local-only repo into github
2. Basics