kangkyu

class Clock
  def self.at(hours=0, minutes=0)
    new(hours, minutes)
  end

  def initialize(hours=0, minutes=0)
    array = minutes.divmod 60

    @minutes = array[1]
    @hours = array[0] + hours

kangkyu

# Today's kata:
# Given a 3 or 4 digit number with distinct digits, return a sorted array of all the unique numbers that can be formed with those digits.
# ie, given 123, return [123, 132, 213, 231, 312, 321]

def same_digit_numbers(initial_num)
  initial_num.to_s.split('').permutation.map {|e| e.join.to_i }.uniq.sort
end

def same_digit_numbers(initial_num)
  num_string = initial_num.to_s

kangkyu

# today's code kata: Write a function called word_count, that takes a sentence as a string as input, and returns the frequency of each word in that sentence, as a hash whose key is the word, and whose count is the number of times that word appears in that sentence.
# 1) ignore case, 2) ignore any non word characters
# Here is the paragraph:
# The quick brown fox jumped over the moon. This mammal did not jump over the sun; it jumped over the moon. And it was quick about it.
# let's use the whole paragraph

def word_count(paragraph)
  paragraph.split(/\W+/).map(&:downcase).each_with_object(Hash.new(0)) {|w, hsh| hsh[w] += 1 }
end

kangkyu

# She has asked you to create a method print_puzzle that prints the row of dashes for a required, single argument, word. The number of dashes or spaces should equal the amount of characters in the word. print_puzzle can also optionally take a list of characters as a second argument that represents the list of guessed letters.
# Given print_puzzle is called with the word "perimeter", your method should output:  _ _ _ _ _ _ _ _ _ 
# Given print_puzzle is called with the word "triangle" and the list of characters guessed: t,s,g, your method should output:  t _ _ _ _ g _ _

def print_puzzle(word, guessed_letters = [])
  word.chars.map {|char| guessed_letters.include?(char) ? " #{char}" : " _"}.join
end

gem 'minitest'
require 'minitest/autorun'

kangkyu

gem 'minitest', '>= 5.0.0'
require 'minitest/autorun'

def reverse(string)
  result = ""
  string.length.times do |i|
    result = string[i] + result
  end
  result
end

kangkyu

# For today, here's the problem for today
# Do whatever you need to do to Ruby, such that I can say: 9 - 8, and the answer will be 17
# And if I say 9 + 8, the answer will be 1
# so - i load whatever code you want to give me via a console, and I should be able to do the above
# turn plus into minus, minus into plus
# a short sentence explaining what you did and why it works would be nice

class Fixnum
  alias_method :temp, :+
  alias_method :+, :-

kangkyu

# add a logger to this class, such that there is only one logger, that writes to a file called ./logfile.txt

class Charlie

  class Logger

    def self.log(number)
      File.open("./logfile.txt", "a") do |f|
        f.puts "#{number}"
      end

kangkyu

=begin
# Question 1. A mixin is a module whose methods you want to use in more than one class. One popular interview question is: How do you use module methods as class methods, and how to you use them as instance methods? In other words, given this module ...

module Mixin

  def method1
    'method1'
  end

end

kangkyu

1. go to exercism.io and login with github account
2. get your api key (navbar > username > api key)
3. install exercism brew install exercism in OSX
4. and set api key to exercism cli http://exercism.io/cli

kangkyu

1. install command-line tool matching OS X version
2. homebrew / npm

sudo chown -R $(whoami):admin /usr/local

3. eventmachine

PKG_CONFIG_PATH="$(brew --prefix openssl)/lib/pkgconfig" gem install eventmachine