gistfile1.md

###Cheat Sheet

####Arrays

Creating Arrays

my_array = ["Apples", "Oranges", "Pears"]

["Apples", "Oranges", "Pears"]

my_array = Array.new

[]

Array.new(3)

[nil, nil, nil]

Array.new(3, "BEWD")

["BEWD", "BEWD", "BEWD"]

Assessing Elements

arr = ["NYC", "LDN", "LA", "SF", "BOS", "BER"]
arr[0]
arr[100]
arr[-3]

NYC

nil

SF

arr[2, 3] #=> [3, 4, 5]

["LA", "SF", "BOS"]

arr[1..4]

[LDN, LA, SF, BOS]

####Hashes

	GA_Markets = { "New York City"=>"NYC", "London"=>"LDN", "Los 	Angeles"=>"LA", "San Francisco"=>"SF", "Boston"=>"BOS", 	"Berlin"=>"BER" }

	GA_Markets["London"]

"LDN"

	super_heros = { batman: "Bruce Wayne", superman: "Clark Kent", 	spiderman: "Peter Parker"}

	super_heros[:superman]

"Clark Kent"

####Loops

Iterator loop

4.times do
  puts "This will be printed 4 times"
end

This will be printed 4 times

This will be printed 4 times

This will be printed 4 times

This will be printed 4 times

Each Loop

		# A list of GA Courses
		courses = [ "FEWD", "BEWD", "CSF" ]

	names.each do|n|
  		puts "GA has a course on #{n}"
	end

GA has a course on FEWD

GA has a course on BEWD

GA has a course on CSF

###Tips, Tricks & Motivation

• The Best Way to Learn Ruby & Rails
• What is iteration - article

###Still Feel Lost? ####Catch Up With These Resources

• Teddit Hashes Answer Video by Steven Nuñez on behalf of General Assembly

  • password=> BEWD_GA

• Arrays Ruby Docs

• Hashes Ruby Docs

• Hashes and Arrays Tutorial

• “Ruby-esque” Loops see page 1 for more ruby loops not covered in class.

No difference in result/output. The difference is that the example in the slides is all in one line, vs three lines in this document. One liners are generally used when you have little code that goes in the block.