Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Computer Science: The Good Parts
Search
Jeff Cohen
August 04, 2017
Programming
0
140
Computer Science: The Good Parts
Kansas City Developers Conference
Jeff Cohen
August 04, 2017
Tweet
Share
More Decks by Jeff Cohen
See All by Jeff Cohen
Modern Cryptography for Absolute Beginner
jeffcohen
0
170
(RubyConf 2016) Computer Science: The Good Parts
jeffcohen
0
330
Computer Science: The Good Parts (2016)
jeffcohen
3
220
Computer Science: The Good Parts
jeffcohen
1
200
Secrets Revealed: Web Development is for Everyone
jeffcohen
0
450
Coding for MBA's
jeffcohen
0
85
Other Decks in Programming
See All in Programming
童醫院敏捷轉型的實踐經驗
cclai999
0
190
LINEヤフー データグループ紹介
lycorp_recruit_jp
0
890
Rubyでやりたい駆動開発 / Ruby driven development
chobishiba
1
400
型付きアクターモデルがもたらす分散シミュレーションの未来
piyo7
0
810
なぜ「共通化」を考え、失敗を繰り返すのか
rinchoku
1
510
A2A プロトコルを試してみる
azukiazusa1
2
1.1k
Google Agent Development Kit でLINE Botを作ってみた
ymd65536
2
180
Haskell でアルゴリズムを抽象化する / 関数型言語で競技プログラミング
naoya
17
4.9k
コードの90%をAIが書く世界で何が待っているのか / What awaits us in a world where 90% of the code is written by AI
rkaga
46
31k
生成AIで日々のエラー調査を進めたい
yuyaabo
0
650
Composerが「依存解決」のためにどんな工夫をしているか #phpcon
o0h
PRO
1
230
Gleamという選択肢
comamoca
6
760
Featured
See All Featured
Making Projects Easy
brettharned
116
6.3k
A better future with KSS
kneath
239
17k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
161
15k
Raft: Consensus for Rubyists
vanstee
140
7k
Six Lessons from altMBA
skipperchong
28
3.8k
Agile that works and the tools we love
rasmusluckow
329
21k
What's in a price? How to price your products and services
michaelherold
246
12k
Side Projects
sachag
455
42k
The World Runs on Bad Software
bkeepers
PRO
69
11k
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.8k
Stop Working from a Prison Cell
hatefulcrawdad
270
20k
Statistics for Hackers
jakevdp
799
220k
Transcript
Computer Science: The Good Parts csthegoodparts.com @jeffcohen
None
None
1. Encoding All The Things 2. Containers for Things 3.
Doing Things 4. Building Big Things 5. Thinking About Things
Data Structures
Data Structures
Linked List 60 31 5 45 70 head
Queue New elements are appended to the end of the
list 60 31 5 45 70 head
Stack 60 45 70 31 5 head New elements are
inserted at the front of the list
60 31 5 45 80 70 74 99 87 68
Binary Tree root
Graph
None
None
None
Algorithms
Babbage and Lovelace
Apollo 11
Margaret Hamilton Source code of the Apollo Guidance Computer
Complexity
Complexity Some computer programming implementations are more complex than others.
Complexity A "green" test suite is not an indicator of
sustainability nor is it a guarantee of an optimal solution.
Complexity Science relies on standard systems of weights and measures.
For software, we measure resources, which are typically time and space.
O(n) def search(name_to_find, names) for name in names if name
== name_to_find return true end end return false end
def search(name_to_find, names) for name in names if name ==
name_to_find return true end end return false end O(n) 0 100 200 300 O(n)
O(log n) def search(name_to_find, sorted_names) return false if sorted_names.size
== 0 midpoint = sorted_names.length / 2 if name < sorted_names[midpoint].name search(name_to_find, sorted_names[0, midpoint]) elsif name > sorted_names[midpoint].name search(name_to_find, sorted_names[midpoint, -1]) end return true end
def search(name_to_find, sorted_names) return false if sorted_names.size == 0
midpoint = sorted_names.length / 2 if name < sorted_names[midpoint].name search(name_to_find, sorted_names[0, midpoint]) elsif name > sorted_names[midpoint].name search(name_to_find, sorted_names[midpoint, -1]) end return true end O(log n) 0 100 200 300 O(log n) O(n)
Atom.io blog post
O(n2) def all_permuations(items) items.map do |item| items.map { |inner_item| [item,
inner_item] } end end [1,2,3] => [[1,1], [1,2], [1,3], [2, 1], [2, 2], [2, 3], [3, 1], [3, 2], [3, 3]]
def all_permuations(items) items.map do |item| items.map { |inner_item| [item, inner_item]
} end end O(n2) 0 100 200 300 O(n2) O(n) O(log n)
Cryptography
Cryptography
Cryptography
Cryptography
The Future
Traditions We know our history. We value progress over reinvention.
We seek solutions to meaningful problems.
Alan Turing
Alan Turing Computer science is not computer programming
Alan Turing It's a way of thinking
Grace Hopper
Grace Hopper
Grace Hopper Humans are allergic to change. They love to
say, "We've always done it this way." I try to fight that. That's why I have a clock on my wall that runs counter-clockwise.
Grace Hopper A ship in port is safe; but that
is not what ships are built for. Sail out to sea and do new things.
Questions? Thoughts? Find me on twitter @jeffcohen Notes, Links, Resources:
csthegoodparts.com