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Persistent data structures, good for UI

@danieroux
Persistent data structures, good for UI
… You & I (sorry)

@danieroux
Modelling Chess
e2-e4
e2-e4
e2-e4

d7-d6
e2-e4

d7-d6
e2-e4

d7-d6

d2-d4
e2-e4

d7-d6

d2-d4
LIE
The conceptual model
does not match reality
Reality
e2-e4
d7-d6
d2-d4
… but what if we keep a
move list
1. e2-e4
2. d7-d6
3. d2-d4
Get back here

1. e2-e4
2. d7-d6
3. d2-d4
Move list is not
reversible …
Keep all the states
Full History
Partial History
react.js
Developer
Machine

react.js
Developer
(person)

Machine

react.js
Developer
(person)

Machine

react.js
Developer
(person)

Machine

Virtual DOM

DOM

react.js
Developer
(person)

Continuously

Machine

Virtual DOM

DOM

react.js
Developer
(person)

Continuously

Machine

Virtual DOM

DOM

Draws new
react.js
Developer
(person)

Continuously

Machine

Virtual DOM

DOM

requestAnimationFrame

Draws new
react.js
Developer
(person)

Continuously

Machine

Virtual DOM

DOM

requestAnimationFrame

Draws new
react.js
Developer
(person)

DOM

Virtual DOM

Draws new

MAGIC

Continuously

Machine

requestAnimationFrame

react.js
Magic = Tree Diffing
And persistent/immutable data structures make that cheaper
Separating concerns
State

Rendering
World

State

Rendering
Logic

World

State

Rendering
Logic

World

State

TIME

Rendering
Logic

World
Updates

State

TIME

Rendering
Logic

World
Uses

Updates

State

TIME

Rendering
Logic

World
Uses

Updates

State

TIME

Value

Rendering
Logic

World
Uses

Updates

State

TIME
Snapshots

Value

Rendering
Logic

World
Uses

Updates

State

TIME
Snapshots

Value

Renders

Rendering
Example code:
!

https://github.com/danieroux/rubyfuza2014
http://facebook.github.io/react
https://github.com/swannodette/om
https://github.com/danieroux/rubyfuza2014

?
Thank you to:
http://designindevelopment.com/css/css3-chess-board

@danieroux
… let’s have coffee

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Persistent data structures - good for UI (presented at Rubyfuza 2014)