Nick Schwaderer Schwad

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.

	[
	["1995-12-21", "0.95"],
	["1996-12-25", "1.0-961225"],
	["1997-12-25", "1.0-971225"],
	["1998-07-17", "1.1c0"],
	["1998-07-24", "1.1c1"],
	["1998-08-11", "1.1c2"],
	["1998-08-27", "1.1c3"],
	["1998-09-03", "1.1c4"],
	["1998-09-08", "1.1c5"],

	Error: Typescript found the following errors:
	/Users/nickschwaderer/Desktop/getting_started/home-library/tmp/broccoli_type_script_compiler-input_base_path-ujnWpQpT.tmp/0/src/app/home-library.component.ts (2, 10): Module '"/Users/nickschwaderer/Desktop/getting_started/home-library/node_modules/@angular/core/index"' has no exported mng 'Http'.
	at BroccoliTypeScriptCompiler._doIncrementalBuild (/Users/nickschwaderer/Desktop/getting_started/home-library/node_modules/angular-cli/lib/broccoli/broccoli-typescript.js:115:19)
	at BroccoliTypeScriptCompiler.build (/Users/nickschwaderer/Desktop/getting_started/home-library/node_modules/angular-cli/lib/broccoli/broccoli-typescript.js:43:10)
	at /Users/nickschwaderer/Desktop/getting_started/home-library/node_modules/angular-cli/node_modules/broccoli-caching-writer/index.js:149:21
	at tryCatch (/Users/nickschwaderer/Desktop/getting_started/home-library/node_modules/angular-cli/node_modules/broccoli-caching-writer/node_modules/rsvp/dist/rsvp.js:538:12)
	at

	def matching_brackets?(arg)
	opener_symbols = ["{", "(", "["]
	closer_symbols = ["}", ")", "]"]
	openers = Hash.new(0)
	closers = Hash.new(0)
	openers['('] = arg.scan(/\(/).length
	openers['['] = arg.scan(/\[/).length
	openers['{'] = arg.scan(/\{/).length
	closers[')'] = arg.scan(/\)/).length
	closers[']'] = arg.scan(/\]/).length

	# Create Fibonnaci Array
	a = [1,2]
	upto = 4_000_000
	while a[-2] + a[-1] < upto
	a << a[-2] + a[-1]
	end

	# Create sum of even Fibonnaci numbers
	sum = 0
	a.each { \|x\| sum+= x if x.even? }