React state managmenet with Redux

Nov 28, 20161 like540 views

When developing applications we have a hard time managing application state, and that is okay because managing application state is hard. We will try to make it easier using Redux. Redux is predictable state management container for JavaScript applications that helps us manage our state while also making our state mutations predictable. Through the presentation and code, I will show you how I solved my state problem with Redux in React application.

Vedran Blaženka
Front-End Developer at Enterwell.
JavaScript, React, Redux, CSS Modules,
PostCSS, Elm...

Tracking server responses
Cached data
Tracking local data
UI state, Show/hide spinner, active
route...
server-side rendering, fetching data
before performing route transitions
etc...

Predictable
Make state mutations predictable by putting
restrictions on how and when updates can
happen.
(actions, reducers)

Single source of truth
The of your whole application is stored in an
object tree within a single .
state
store

State is read-only
The only way to change the state is to emit an ,
an object describing what have or should happened.
action

Changes are made with
pure functions
To specify how the state tree is transformed by actions,
you write pure .reducers

Data Flow
strict unidirectional data ﬂow

$Actions { type: 'ADD_TODO', payload: { text: 'Build my first Redux app' } } https://github.com/acdlite/ﬂux-standard-action 1. Something has (or should) happen 2. Don't specify how$

$Action Creator function addTodo(text) { return { type: 'ADD_TODO', payload: { text } } } store.dispatch(addTodo('Write blog post'));$

Reducer
(previousState, action) => newState
Pure function that takes the previous state,
and an action and returns the new state.

$function todoReducer(state = [], action) { switch(action.type) { case 'ADD_TODO': return [ ...state, action.payload ]; case default: return state; } } export default todoReducer; function addTodo(text) { return { type: 'ADD_TODO', payload: { text } } } store.dispatch(addTodo('Write blog post'));$

Things you should never do inside a reducer:
Mutate its arguments;
Perform side effects like API calls and routing
transitions;
Call non-pure functions, e.g. Date.now() or
Math.random().

Just a calculation!
Immutability
No surprises. No side effects. No API
calls. No mutations.

State vs. Store
Do whatever is less awkward. - Adam Abramov
http://redux.js.org/docs/faq/OrganizingState.
html#organizing-state-only-redux-state

Marc was almost ready to implement
his "hello world" React/Redux app

Pros:
Total separation of data and UI
Server-side rendering
Developer Experience (DevTools, Time Travel, Logging)
Growing ecosystem
Easy error reporting integration with other services
(Sentry)
Strinct unidirectional data ﬂow
Redux API - 99 lines of code

Cons:
Community conventions are still developing
"Feels bloated, too much boilerplate code..."
¯_( )_/¯ (shrug emoji)

http://redux.js.org/
https://egghead.io/courses/getting-started-
with-redux
https://facebook.github.io/immutable-js/
https://github.com/reactjs/react-redux
https://github.com/gaearon/redux-thunk
Resources (za one koji žele znati više) :

Hvala na pažnji!
Vedran Blaženka
@vblazenka
blazenka.vedran@gmail.com

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