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
Optimizing Code for Humans
Search
Felipe Ribeiro
May 11, 2017
Programming
6
390
Optimizing Code for Humans
Felipe Ribeiro
May 11, 2017
Tweet
Share
More Decks by Felipe Ribeiro
See All by Felipe Ribeiro
[Draft] My tech career abroad
felipernb
0
18
JavaScript @ Spotify - JSConf Iceland 2016
felipernb
4
390
Other Decks in Programming
See All in Programming
Netty Chicago Java User Group 2024-04-17
sullis
0
180
Compose-View Interop in Practice (mDevCamp 2024)
stewemetal
0
140
使ってみよう Azure AI Document Intelligence
kosmosebi
2
330
Polars入門
daikikatsuragawa
1
100
TCAとKMPを用いた新規動画配信アプリ 「ABEMA Live」の設計
tomu28
1
120
Node.js v22 で変わること
yosuke_furukawa
PRO
9
3.5k
Amazon SQSコンシューマー疎結合への旅 - 出張! #DevelopersIO IT技術ブログの中の人が語る勉強会 #3
quiver
0
280
Snowflakeで眠ったデータを起こそう!
estie
0
120
新宿ダンジョンを可視化してみた
satoshi7190
2
270
TYPO3 v13 – The road to LTS: What's new and new APIs
luisasofie_xoxo
0
210
2 週間で Twitter Bot を作ってみた
contour_gara
0
610
Ruby Function Composition
bkuhlmann
1
330
Featured
See All Featured
Why Our Code Smells
bkeepers
PRO
331
56k
RailsConf 2023
tenderlove
4
540
Done Done
chrislema
178
15k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
17
1.4k
Atom: Resistance is Futile
akmur
259
25k
How to Ace a Technical Interview
jacobian
272
22k
The Brand Is Dead. Long Live the Brand.
mthomps
49
29k
Web development in the modern age
philhawksworth
202
10k
GitHub's CSS Performance
jonrohan
1025
450k
Ruby is Unlike a Banana
tanoku
96
10k
Into the Great Unknown - MozCon
thekraken
10
1k
Design by the Numbers
sachag
274
18k
Transcript
Optimizing code for humans @felipernb !
“Any fool can write code that a computer can understand.
Good programmers write code that humans can understand.” Martin Fowler - @martinfowler @felipernb !
Simplicity is subjective (?) ! @felipernb !
“The purpose of software engineering is to control complexity, not
to create it.” Pamela Zave @felipernb !
“A C program with six 32-bit integers can have more
states than the number of atoms on the planet” Joe Armstrong - @joeerl @felipernb !
Programming is hard ! @felipernb !
Where does complexity creep in? ! @felipernb !
Algorithms ! @felipernb !
“Fancy algorithms are buggier than simple ones, and they're much
harder to implement.” Rob Pike's Rule #4 - @rob_pike @felipernb !
Searching // O(n) function linearSearch(arr, x) { for (let i
= 0; i < arr.length; i++) { if (arr[i] === x) return true; } return false; } @felipernb !
“Oh! But my array is always sorted, so I can
make this faster. Let's get fancy!” Developer ! @felipernb !
Fancy search // Sorted arrays only, O(lg n) function binarySearch(arr,
x) { let low = 0; let high = arr.length - 1; while (low <= high) { const mid = ((high - low) >> 1) + low; if (arr[mid] === x) return true; if (a[mid] < element) low = mid + 1; else high = mid - 1; } return false; } @felipernb !
“Fancy algorithms are slow when n is small, and n
is usually small.” Rob Pike’s Rule #3 - @rob_pike @felipernb !
Don't get fancy! ! @felipernb !
“Data structures, not algorithms, are central to programming.” Rob Pike’s
Rule #5 - @rob_pike @felipernb !
Performance ! @felipernb !
“Premature optimization is the root of all evil” Donald Knuth
@felipernb !
“If it doesn’t work, it doesn’t matter how fast it
doesn’t work.” Mich Ravera @felipernb !
“The cleaner and nicer the program, the faster it's going
to run. And if it doesn't, it'll be easy to make it fast.” Joshua Bloch - @joshbloch @felipernb !
“Measure. Don't tune for speed until you've measured, and even
then don't unless one part of the code overwhelms the rest.” Rob Pike’s Rule #2 - @rob_pike @felipernb !
Novelty ✨ @felipernb !
“Surprise is one of the most expensive things you can
put into a software architecture.” Adam Tornhill - @adamtornhill @felipernb !
Boring is fine ! @felipernb !
“Are you quite sure that all those bells and whistles,
all those wonderful facilities of your so called powerful programming languages, belong to the solution set rather than the problem set?” Edsger W. Dijkstra @felipernb !
Naming things ! @felipernb !
“There are two hard things in Computer Science: cache invalidation,
naming things, and off-by- one errors.” Phil Karlton + the internet @felipernb !
Descriptive names can replace //comments @felipernb !
doThisAndThatAndReturnThisOtherThing(); If it's hard to name it, it's probably doing
too much @felipernb !
// Double negation is confusing ! if (!disabledFeature) { //
it's enabled! } Avoid flag names with negative meanings such as disable and disallow @felipernb !
Personal taste ❤ @felipernb !
“I do not like semicolons.” Some guy closing a perfectly
valid pull request ! @felipernb !
“You can't always get what you want.” The Rolling Stones
@felipernb !
Strict style guides are good ! @felipernb !
The code should be consistent regardless of who wrote it.
@felipernb !
Automation can put an end to lengthy and pointless discussions*
. * Specially when we all know that tabs make much more sense than spaces. @felipernb !
When consistency is a given, you can focus on what
really matters. @felipernb !
The ! Enterprise @felipernb !
“Any organization that designs a system will produce a design
whose structure is a copy of the organization's communication structure.” Conway's law @felipernb !
Cargo Cult ✈ @felipernb !
“A significant amount of programming is done by superstition” Chris
Siebenmann @felipernb !
Be ! skeptical @felipernb !
Tech Debt ! @felipernb !
“If you want to go fast you take some debt.
But the misunderstanding was that people thought that you never have to pay it back.” Ward Cunningham - @wardcunningham @felipernb !
“Technical debt is hard to explain, but a picture is
worth a thousand words” Jedd Ahyoung - @Jedd_Ahyoung @felipernb !
How to keep things sane? ! @felipernb !
KISS ! Keep it simple, stupid @felipernb !
“Everyone knows that debugging is twice as hard as writing
a program in the first place. So if you're as clever as you can be when you write it, how will you ever debug it?” Brian Kernighan @felipernb !
Design patterns ⛩ @felipernb !
Design patterns are not about pigeonholing problems, but a tool
to efficiently communicate solutions with a common vocabulary. @felipernb !
Refactoring ! @felipernb !
“Software is messy because it reflects our evolving understanding of
the problem as we wrote it.” Sarah Mei - @sarahmei @felipernb !
Unlike the messed up Tetris game, you should be able
to take the time to rearrange the pieces in your code. @felipernb !
Code reviews ! @felipernb !
“My code isn't done until I've gone over it with
a fellow developer.” Jeff Atwood - @codinghorror @felipernb !
Peer review ≠ Pair programming @felipernb !
@felipernb !
Pragmatism ! @felipernb !
“Engineers are hired to say no.” Uncle Bob Martin -
@unclebobmartin @felipernb !
@felipernb !
Sometimes you have to say no to fun @felipernb !
Thank you! @felipernb !