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
Programming by Hyperbole
Search
Einar W. Høst
March 13, 2013
Programming
0
110
Programming by Hyperbole
Lightning talk from the Booster 2013 conference.
Einar W. Høst
March 13, 2013
Tweet
Share
More Decks by Einar W. Høst
See All by Einar W. Høst
No Silver Bullet (Fred Brooks)
einarwh
0
130
einarwh-death-of-a-craftsman-boosterconf-2019_original.pdf
einarwh
1
140
Technical debt isn't technical
einarwh
5
740
Other Decks in Programming
See All in Programming
議事録の要点整理を自動化! サーバレス Bot 構築術
penpeen
3
1.6k
uniqueパッケージの内部実装を支えるweak pointerの話
magavel
0
880
2分台で1500examples完走!爆速CIを支える環境構築術 - Kaigi on Rails 2025
falcon8823
3
2.8k
CSC305 Lecture 01
javiergs
PRO
1
380
メモリ不足との戦い〜大量データを扱うアプリでの実践例〜
kwzr
1
740
気づいて!アプリからのSOS 〜App Store Connect APIで始めるパフォーマンス健康診断〜
waka12
0
260
ABEMAモバイルアプリが Kotlin Multiplatformと歩んだ5年 ─ 導入と運用、成功と課題 / iOSDC 2025
akkyie
0
310
いま中途半端なSwift 6対応をするより、Default ActorやApproachable Concurrencyを有効にしてからでいいんじゃない?
yimajo
2
310
フロントエンド開発に役立つクライアントプログラム共通のノウハウ / Universal client-side programming best practices for frontend development
nrslib
7
3.8k
Playwrightはどのようにクロスブラウザをサポートしているのか
yotahada3
7
2.2k
麻雀点数計算問題生成タスクから学ぶ Single Agentの限界と Agentic Workflowの底力
po3rin
5
2.1k
2025年版 サーバーレス Web アプリケーションの作り方
hayatow
23
25k
Featured
See All Featured
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Learning to Love Humans: Emotional Interface Design
aarron
274
40k
Why You Should Never Use an ORM
jnunemaker
PRO
59
9.5k
Context Engineering - Making Every Token Count
addyosmani
4
160
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
52
5.6k
Testing 201, or: Great Expectations
jmmastey
45
7.7k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.5k
The Cost Of JavaScript in 2023
addyosmani
53
9k
Building an army of robots
kneath
306
46k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.4k
Embracing the Ebb and Flow
colly
88
4.8k
Fireside Chat
paigeccino
40
3.7k
Transcript
Programming by Hyperbole Einar W. Høst
Take a small task from work Take a small
but real problem you encounter at work.
Bring it back home where no-‐one can ques@on
your ra@onale.
Apply hyperbole to exaggerate, distort &
bend it.
(Blog about it and put it on github.)
What is hyperbole?
Normal Normal HYPERBOLE NORMAL
Normal You see a string in your program
and you think... NORMAL
Normal “Yup, that’s a string.” NORMAL
“Hey, that’s a string.” HYPERBOLE You see a
string in your program and you think...
“Hey, that’s a string.” HYPERBOLE “I could put
a programming language in there.”
Why?
None
Understanding is limited
Understanding is par@al
Understanding is full of myths and half-‐truths
Understanding is misunderstanding
Understanding is plain wrong
Understanding is not improved at work
Hyperbole helps
Hyperbole by Example
5 + 2 * 3 Actual Business Case
In my HTML form, how can I validate that a DateTime value is between two other DateTime values?
5 + 2 * 3 ASP.NET MVC Model Valida@on
5 + 2 * 3 ASP.NET MVC Model Valida@on
public class User { [ Required ] public string UserName { get; set; } [ Required ] [ MinLength(12) ] public string Password { get; set; } }
5 + 2 * 3 Data Annota@on Validator Adributes
> Required > Range > RegularExpression > MinLength > MaxLength > ...
5 + 2 * 3 Data Annota@on Validator Adributes
> Required > Range > RegularExpression > MinLength > MaxLength > ...
5 + 2 * 3 Data Annota@on Validator Adributes
> Required > Range > RegularExpression > MinLength > MaxLength > ...
5 + 2 * 3 Data Annota@on Validator Adributes
> Remote > Custom
5 + 2 * 3 Data Annota@on Validator Adributes
> Remote > Custom
5 + 2 * 3 Actual Business Solu@on
Custom valida@on to solve a very specific problem.
5 + 2 * 3 Hyperbolic Developer Ques@on
Is there a generic solu@on?
5 + 2 * 3 Hyperbolic Developer Ques@on
What would be the ul@mate approach?
5 + 2 * 3 Hyperbolic Developer Ques@on
Can this be solved once and for all?
5 + 2 * 3 Hyperbolic Developer Ques@on
What is the final word on valida@on?
$ $ Developer Constraint At Work Business
value Time spent
$ $ Developer Constraint At Home
5 + 2 * 3 Custom Valida@on Adribute
[ Custom(........) ]
5 + 2 * 3 Custom Valida@on Adribute
[ Custom(........) ] Severely limited
5 + 2 * 3 Custom Valida@on Adribute
[ Custom(“foo”) ] ...but strings are OK
5 + 2 * 3 Custom Valida@on Adribute
[ Custom(“foo”) ] ...strings are OK?
5 + 2 * 3 Custom Valida@on Adribute
[ Custom(“foo”) ] I could put a programming language in there!
5 + 2 * 3 My Hyperbolic Idea
Create a rule DSL for expressing arbitrary constraints on property values in a LISP-‐like syntax.
5 + 2 * 3 Why?
5 + 2 * 3 Why? Do. Or
do not. There is no why.
5 + 2 * 3 Why? If it
fits, I sits
5 + 2 * 3 Why? > Custom
Valida@on > S-‐expressions > Expression Trees > Func@onal JavaScript > Code Genera@on > Code Interpreta@on Learning opportunity
(+ 5 (* 2 3)) [ Mkay(“(and (> A)
(< B))”) ] Introducing Mkay One valida@on adribute to rule them all
(+ 5 (* 2 3)) Mkay expressions >
Constants > Property access > Logical operators > Comparison operators > Simple func@ons
(+ 5 (* 2 3)) Example #1 [
Mkay(“>= (max A B)”) ]
(+ 5 (* 2 3)) Example #2 [
Mkay(“== (len .) 5”) ]
(+ 5 (* 2 3)) Example #3 [
Mkay(“and (> “31.01.2006”) (<= (now))”) ]
Rule AST Cons Cells .NET Expression
Trees JavaScript JSON Server-‐side valida@on Client-‐side valida@on Rule DSL String .NET Func@on JavaScript Func@on
(+ 5 (* 2 3)) Mkay Rule DSL
(> . (+ A B C))
(+ 5 (* 2 3)) Abstract Syntax Tree
symbol > symbol + symbol . nil symbol A symbol B symbol C nil (> . (+ A B C))
(+ 5 (* 2 3)) Expression Tree Member
. Member B Member A Member C Binary + Binary > Binary + (> . (+ A B C))
(+ 5 (* 2 3)) JSON {
"type": "call", "value": ">", "operands": [ { "type": "property", "value": "X" }, { "type": "call", "value": "+", "operands": [ { "type": "property", "value": "A" }, { "type": "property", "value": "B" }, { "type": "property", "value": "C" } ] } ] } (> . (+ A B C))
(+ 5 (* 2 3)) Composed Valida@on Func@on
function() { return greater-‐than-‐function ( read-‐property-‐function("."), plus-‐function( plus-‐function( plus-‐function( 0, read-‐property-‐function("C")), read-‐property-‐function("B")), read-‐property-‐function("A")) ); } Pseudo-‐JavaScript
5 + 2 * 3 Demo
5 + 2 * 3 Demo public class
Person { [ Mkay("(< (len .) 5)", ErrorMessage = "That's too long, my friend.") ] public string Name { get; set; } [ Mkay("(>= . \"31.01.1900\")") ] public DateTime BirthDate { get; set; } [ Mkay("(<= . (now))") ] public DateTime DeathDate { get; set; } [ Mkay("(and (>= . BirthDate) (<= . DeathDate))") ] public DateTime LastSeen { get; set; } }
Demo
BLOG hdp://einarwh.wordpress.com CODE hdp://bitbucket.org/einarwh/mkay DOWNLOAD
hdp://nuget.org/packages/mkay
5 + 2 * 3 HYPERBOLIC HYPERBOLE
5 + 2 * 3 eval
None
“Hey, that’s a string.” HYPERBOLE You see a
string in your program and you think...
“Hey, that’s a string.” HYPERBOLE “I could put
a programming language in there.”
GO ONE LOUDER