Erik G egrueter-dev

ALGORITHMS AND INTERVIEW QUESTIONS CHEAT SHEET

DATA STRUCTURES

A data structure is a group of data organized in the computer's memory by certain specific rules defining predictable relationships between the data. Arrays, hashes and relational databases are all examples of data structures.

	puts "Say Something to Grandma"
	bye = 0

	while bye < 3
	reply = gets.chomp
	if reply == "BYE"
	bye += 1
	elsif reply == reply.upcase #condition, not variable put ==
	puts "No, not since #{rand(1930..1950)}" #string interpolation "#{variable}" #Use .. to do numbers inclusive (... exclusive
	else

	class Song

	def booze (bottle, number)
	@bottle = bottle
	@number = number
	end

	def sing
	while number != 0
	puts "#{number} Bottles of #{bottle} on the wall, #{number} bottles of #{bottle}, you take one down, pass it around #{number-1} bottles of #{bottle} on the wall"


	#Using the array of hashes above, output the titles, along with their year to achieve the following output.
	# 1998: The Big Lebowski
	# 1980: The Shining
	# 1990: Troll 2

	favorite_movies = [
	{ title: 'The Big Lebowski', year_released: 1998, director: 'Joel Coen', imdb_rating: 8.2 },
	{ title: 'The Shining', year_released: 1980, director: 'Stanley Kubrick', imdb_rating: 8.5 },
	{ title: 'Troll 2', year_released: 1990, directory: 'Claudio Fragasso', imdb_rating: 2.5 }

	class GuessingGame
	def initialize(guess)
	$user_choice = guess
	$comp_selection = rand(1...1000)
	end

	def numeric?(user_choice)
	true if Float(user_choice) rescue false
	end

	def quick_sort(arr)
	return arr if arr.length <= 1
	pivot = arr.pop
	less_than_pivot = arr.select { \|x\| x < pivot }
	greater_than_pivot = arr.select { \|x\| x > pivot }
	quick_sort(less_than_pivot) + [pivot] + quick_sort(greater_than_pivot)
	end

	print quick_sort([1,5,9,2,45,2,3,4,4545])

	// Use Gists to store code you would like to remember later on
	console.log(window); // log the "window" object to the console


	# This index handler lets you navigate to the following routes:
	#category_drinks \| GET \| /categories/:category_id/drinks(.:format) \| drinks#index
	# drinks \| GET \| /drinks(.:format) \| drinks#index
	# and...
	def index
	if params.include?('category_id')
	category = Category.find(params[:category_id])
	@drinks = Drink.where(category: category).page(params[:page])
	else

	var d = new Date(1394648309130.185)
	d // Wed Mar 12 2014 11:18:29 GMT-0700 (Pacific Daylight Time)

	d.getTime()
	// 1394648309130 // Fractions of a millisecond are dropped

	.body-class {
	min-height: 84%;

	}