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Object Invariants, 
Immutability & You 
Making Objects Do Your Bidding 
Domcode 26-11-2014
Jeroen v.d. Gulik 
• CTO / Founder Isset (http://isset.nl) 
• Builder of Artificial Stupidity 
• @n0x13 
• Likes Cats … a lot
“Every Great talk should 
start with a Quote” 
- Ross Tuck
Telephone Game
“People Lie, therefore 
Objects Lie” 
- Jeroen v.d. Gulik
Objects as dumb data 
stores 
This is our industry standard
Object invariants, immutability & you lightning talk
Object invariants, immutability & you lightning talk
Context and Intent get lost 
- Ronald Reagan
Objects should have 
behaviour attached to 
them 
- Mao Zedong
Object invariants, immutability & you lightning talk
Object invariants, immutability & you lightning talk
Object invariants, immutability & you lightning talk
Objects should tell a tale about its 
current state and all the possible 
ways to change that state 
- Adolf Hitler
Object invariants, immutability & you lightning talk
Object invariants, immutability & you lightning talk
Object invariants, immutability & you lightning talk
Objects should be 
responsible for their own 
internal consistency
Schrödinger's cat 
- Michael Jackson
Make the Implicit, 
Explicit
UnpaidOrder PaidOrder
Object invariants, immutability & you lightning talk
Object invariants, immutability & you lightning talk
“Sounds like a State Machine” 
- Igor Wiedler
Immutability
UnpublishedArticle PublishedArticle
UnpublishedArticle PublishedArticle 
Draft Article
Object invariants, immutability & you lightning talk
Draft Article RetractedArticle
Object invariants, immutability & you lightning talk
Magic is bad, hmmmkay 
- Mahatma Ghandi
Objects should … 
• Be responsible for their own internal state 
• Have specific behaviour towards its 
responsibility 
• Broadcast their state 
• Only care about the state it’s currently in.
Questions?
Please rate my talk: 
https://joind.in/12818

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Object invariants, immutability & you lightning talk