Mobx Internals

MobX
Performance and Sanity
Adam Klein

ADAM KLEIN
C E O / C O - F O U N D E R

• Persist state to a local storage and then boot up from it, out of
the box.
• Pre-fill state on the server, send it to the client in HTML, and boot
up from it, out of the box.
• Serialize user actions and attach them, together with a state
snapshot, to automated bug reports, so that the product
developers can replay them to reproduce the errors.
• Pass action objects over the network to implement collaborative
environments without dramatic changes to how the code is
written.
• Maintain an undo history or implement optimistic mutations
without dramatic changes to how the code is written.
• Travel between the state history in development, and re-evaluate
the current state from the action history when the code changes,
a la TDD.
• Provide full inspection and control capabilities to the development
tooling so that product developers can build custom tools for their
apps.
• Provide alternative UIs while reusing most of the business logic.
Why Redux

People often use MobX as alternative for Redux.
Please note that MobX is just a library to solve a
technical problem and not an architecture
MICHEL WESTRATE
M O B X C R E A T O R

MobX has no
• Stores
• Data Flow
• Architecture Paradigm

• Persist state to a local storage and then boot up from it, out of
the box.
• Pre-fill state on the server, send it to the client in HTML, and boot
up from it, out of the box.
• Serialize user actions and attach them, together with a state
snapshot, to automated bug reports, so that the product
developers can replay them to reproduce the errors.
• Pass action objects over the network to implement collaborative
environments without dramatic changes to how the code is
written.
• Maintain an undo history or implement optimistic mutations
without dramatic changes to how the code is written.
• Travel between the state history in development, and re-evaluate
the current state from the action history when the code changes,
a la TDD.
• Provide full inspection and control capabilities to the development
tooling so that product developers can build custom tools for their
apps.
• Provide alternative UIs while reusing most of the business logic.
MobX State Tree

Some Facts
15K
stars
G I T H U B
3
latest commit
D AYS A G O
5.0.3
version on npm
L AT E S T
28
on egghead.io
F R E E V I D E O S

Battlefield 1
MS Outlook
Datorama
AWS
Simplee
Sap
Coinbase
Mendix
And many more…
Used
By

Tool for Making Objects Reactive
MobX

class Model {
email = ‘adam@500tech.com’;
setEmail(email) {
this.email = email;
}
}
Plain Object

<input type="email"/>
input.value = model.email;
model.setEmail(‘nir@500tech.com’)
model.setEmail(‘ilya@500tech.com’)
...
Reaction

<input type="email"/>
import { autorun } from 'mobx';
autorun(() => {
});
MobX API

import { observable } from 'mobx';
class Model {
@observable email = ‘adam@500tech.com’;
setEmail(email) {
this.email = email;
}
}
Reactive Object

@observable prop => getter and setter
Under the hood

autorun(() => {
});
...
Our Code MobX

autorun(() => {
});
...
Our Code MobX
// create reaction
{
name: ‘Autorun1’
}

autorun(() => {
});
...
Our Code MobX
// access getter
{
name: ‘Autorun1’
}

autorun(() => {
});
...
Our Code MobX
// add dependency
{
name: ‘Autorun1’,
dependencies: [
{ name: ‘model.email’ }
]
}

autorun(() => {
});
...
Our Code MobX
// invoke setter

autorun(() => {
});
...
Our Code MobX
// look for reactions

autorun(() => {
});
...
Our Code MobX
// invoke reaction (sync)
autorun1();

class Model {
@observable isValid = true;
setEmail(email) {
this.email = email;
this.isValid = this.email.match(regexp);
}
}
Duplicate State

import { observable, computed } from 'mobx';
class Model {
@computed get isValid() {
return this.email.match(regexp);
}
setEmail(email) {
this.email = email;
}
}
Computed Value

class Model {
@observable data;
fetchData() {
serverApi.getData().then((data) => {
this.data = data;
});
}
}
Async Operations

class Input extends React.Component {
render() {
return (
<form>
<input value={ model.email }/>
<button disabled={ model.isValid }>Go</button>
</form>
);
}
}
React

import { observer } from 'mobx-react';
@observer
class Input extends React.Component {
render() {
return (
<form>
<input value={ model.email }/>
<button disabled={ model.isValid }>Go</button>
</form>
);
}
}
React

Shopping Cart Demo
g i t H u b . c o m / 5 0 0 t e c h / m o b x - s h o p p i n g - c a r t
Dynamic Observable
Properties
Provider <=> inject
Normalized State
Store Hierarchy
Auto persist to
localStorage

P O W E R
35
Thank You
@ _ 5 0 0 T e c h
s l i d e s h a r e . n e t / 5 0 0 T e c h

Mobx Internals

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