xullnn

## binary_s.rb
require 'benchmark'

def binary_search(arr, given_element)

  length = arr.size
  t = 1                                     # search times, used to locate every step's relative_position
  relative_position = 0.5                   # compared element's relative position, initialized as 0.5 (1/2)
  current_index = (1/2.to_f * length)
  e = arr[current_index]                    # the element compared with the given_element, first time it'll be the "middle" one

## travel_destination.rb
class Destination
  attr_accessor :name, :time_cost, :weight
  def initialize(name,time_cost,weight)
    @name = name
    @time_cost = time_cost
    @weight = weight
  end
end

class Schedule

## knapsack.rb
class Item
  attr_accessor :name, :weight, :price
end

class Knapsack
  attr_accessor :items, :capacity, :table

  def initialize(capacity)
    @items = []
    @capacity = capacity

## mango_seller_with_comments.rb
class Person
  attr_accessor :name, :is_seller, :friends
  def initialize
    @name = ('a'..'z').to_a.sample(5).join.capitalize!
    @is_seller = false
    @friends = []
  end
end

def make_friends(n)

## decipher.rb
encoded_text = <<-MSG
snmft
ltslcnsnonjhmzemjizfsbjsenijmfsdn
cnfrnfsbtdftonftljnsndnljwjsbz
emndtzsnbfshmjslqjemjljwjsbz
hfndtzonmznmztijonfsluns
efnrnrfczjpjhmjslemtsl
btrjshmzqjczjcnqjifqnfslonfrnmjonjrnijemnxmn
mfnqnftonjqjxmnljemzrnslijrnrfczjwjsbzyfrjsljozkjsllj
dtzcnjwjsxznwfsefteftonzvzxmnqjifsqnzcnfqjgftlznijxmzczjhmjsllzt

## update_yaml.rb
f = File.open("./example.yaml", "w")
100000.times do |n|
  str = "user_#{n}:\n  id: #{n}\n  score: 0\n"
  File.write("./example.yaml", str, mode: "a")
end

def find_position(target, file_obj)
  file_obj.pos = file_obj.read =~ Regexp.new(target)
end

## halfway_in_ls.md

      
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                xullnn
                / halfway_in_ls.md
            
            
              Created
              April 12, 2019 03:35
            
              
                Halfway in LS
              
          
    Halfway in my Launch School journey

I've just finished Database course in Launch School(hereinafter refer as LS), it's about half of its core curriculum. I prefer to call LS as a journey, because life in LS is more than what we do in a traditional "school".
Thanks to Internet

I live in a very small city in China, and I never knew or cared about anything about programming until 28. But thanks to Internet, I met LS. I was deeply drawn by LS's pedagogy. Instead of selling you the course urgently, LS provides a free preparatory course and advises you to make the decision after you've evaluated your feelings about the pre-course and you are agree with their pedagogy.
What I appreciate about LS


## nutrition_facts.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <style>

      html {
        font-size: 32px;
        font-family: "Helvetica Black", Helvetica;
      }

## revised_nutrition_facts.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <style>

      html {
        font-size: 23px;
        font-family: sans-serif;
        font-weight: lighter;

## rot13.js
const LOWER_START = 97;
const UPPER_START = 65;
const LOWER_END = LOWER_START + 26;
const UPPER_END = UPPER_START + 26;

function newAsciiOf(char) {
  var newAscii = char.charCodeAt() + 13;

  if (/[a-z]/.test(char) && newAscii >= LOWER_END) {
    newAscii = (LOWER_START + (newAscii % LOWER_END));
	require 'benchmark'

	def binary_search(arr, given_element)

	length = arr.size
	t = 1 # search times, used to locate every step's relative_position
	relative_position = 0.5 # compared element's relative position, initialized as 0.5 (1/2)
	current_index = (1/2.to_f * length)
	e = arr[current_index] # the element compared with the given_element, first time it'll be the "middle" one
	class Destination
	attr_accessor :name, :time_cost, :weight
	def initialize(name,time_cost,weight)
	@name = name
	@time_cost = time_cost
	@weight = weight
	end
	end

	class Schedule
	class Item
	attr_accessor :name, :weight, :price
	end

	class Knapsack
	attr_accessor :items, :capacity, :table

	def initialize(capacity)
	@items = []
	@capacity = capacity
	class Person
	attr_accessor :name, :is_seller, :friends
	def initialize
	@name = ('a'..'z').to_a.sample(5).join.capitalize!
	@is_seller = false
	@friends = []
	end
	end

	def make_friends(n)
	encoded_text = <<-MSG
	snmft
	ltslcnsnonjhmzemjizfsbjsenijmfsdn
	cnfrnfsbtdftonftljnsndnljwjsbz
	emndtzsnbfshmjslqjemjljwjsbz
	hfndtzonmznmztijonfsluns
	efnrnrfczjpjhmjslemtsl
	btrjshmzqjczjcnqjifqnfslonfrnmjonjrnijemnxmn
	mfnqnftonjqjxmnljemzrnslijrnrfczjwjsbzyfrjsljozkjsllj
	dtzcnjwjsxznwfsefteftonzvzxmnqjifsqnzcnfqjgftlznijxmzczjhmjsllzt
	f = File.open("./example.yaml", "w")
	100000.times do \|n\|
	str = "user_#{n}:\n id: #{n}\n score: 0\n"
	File.write("./example.yaml", str, mode: "a")
	end

	def find_position(target, file_obj)
	file_obj.pos = file_obj.read =~ Regexp.new(target)
	end
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8">
	<style>

	html {
	font-size: 32px;
	font-family: "Helvetica Black", Helvetica;
	}
	const LOWER_START = 97;
	const UPPER_START = 65;
	const LOWER_END = LOWER_START + 26;
	const UPPER_END = UPPER_START + 26;

	function newAsciiOf(char) {
	var newAscii = char.charCodeAt() + 13;

	if (/[a-z]/.test(char) && newAscii >= LOWER_END) {
	newAscii = (LOWER_START + (newAscii % LOWER_END));