Ex with a combineReducers() function todos(state = [], action) { // Somehow calculate it... return nextState } function visibleTodoFilter(state = 'SHOW_ALL', action) { // Somehow calculate it... return nextState } let todoApp = combineReducers({ todos, visibleTodoFilter })

Aurélie Bayre

React & Redux

For webdevelopers: learning to use React and Redux

Aurélie Bayre

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why JSX?

Aurélie Bayre

can you have more than one root dom nodes?

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How do you render an element into the dom?

Aurélie Bayre

Are React elements mutable?

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There are two ways of defining a component: as a function and as a ...

Aurélie Bayre

What is the advantage of a class component over a functional component?

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How do you add local state to a class?

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why are lifecycle hooks important?

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Does redux work only with react?

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Core concepts: actions reducers

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what's an action for redux?

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What's the purpose of a reducer?

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what are the 2 params passed to a reducer?

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what are the advantages of a single store?

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How is Redux different from Flux?

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advantage of immutability in Redux?

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Redux architecture revolves around a strict unidirectional data flow.

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Data lifecycle: 1. You call store.dispatch(action) 2. Redux store calls the reducer function 3. combine output of multiple reducer into on single state tree 4. Redux store returns the complete state tree (returned by the root reducer)

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React bindings for Redux embrace the idea of separating presentational and container components.

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Container Components: How things work (data fetching, state updates) Dispatch Redux actions Are usually generated by React Redux

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Presentational Components How things look (markup, styles) Invoke callbacks from props to change data Are written by hand

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You could write a container component by hand, but we suggest instead generating container components with the React Redux library's connect() function, which provides many useful optimizations to prevent unnecessary re-renders.

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To use connect(), you need to define a special function called mapStateToProps that tells how to transform the current Redux store state into the props you want to pass to a presentational component you are wrapping.

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In addition to reading the state, container components can dispatch actions. In a similar fashion, you can define a function called mapDispatchToProps() that receives the dispatch() method and returns callback props that you want to inject into the presentational component.

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Connecting react and redux: import { connect } from 'react-redux' const VisibleTodoList = connect( mapStateToProps, mapDispatchToProps )(TodoList) export default VisibleTodoList

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Redux component <Provider> : is used to magically make the store available to all container components in the application without passing it explicitly. You only need to use it once when you render the root component:

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How do you use <provider> ?

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Publicity, publicity, publicity is the greatest moral factor and force in our public life.

Joseph Pulitzer

When your effort results in the desired effect, then you have worked.

Tara Fela-Durotoye

When you're a kid, your first five or six years, you converge all the time. School is about training that out of you, especially universities.

Lawrence Weschler

Every one of us is a perfect human being, deformed by the family, the society and the culture.

Alejandro Jodorowsky

It is not the pain and the wounds that are the worst. The worst is the humiliation.

Pascal Mercier

My mother's parents, Bernard and Rivka Levine, were from Russia and also immigrated to New York City. My mother, Rose, was the elder of their two daughters. My maternal grandmother's family included several scholars and professionals.

Robert Lefkowitz

Despite what you might guess, when monitoring your breathing, your body doesn't care whether you're inhaling enough oxygen. It cares only whether you're expelling enough carbon dioxide - that's the gas that sets off the panic button when you're suffocating.

Sam Kean

Lack of emotion causes lack of progress and lack of motivation.

Tony Robbins

My job is not babysitting people; my job is focusing on making the best band I possibly can.

Jerry Only

How often have I met and disliked writers whose books I love; and conversely, hated the books and then wound up liking the writer? Too often.

Lev Grossman

I had choosen the path of the black sheep rather than that of the unicorns and puppies.

Magenta Periwinkle

Guitars have been the obsession of my life. I first picked one up at the age of four and I've been a guitar junkie ever since.

Johnny Marr

I wanted to be a journalist because I like to ask questions. And I like the idea that someone might feel responsible for answering them.

Gwen Ifill

If I have got a swing, I have got a shot.

Bubba Watson

Whenever a Republican gets in office all of a sudden progressives realize that federalism and states rights arent necessarily only about defending slavery or Jim Crow. Theyre actually about maximizing freedom.

Jonah Goldberg

My philosophy is that on a scale of 1 to 10, I will go to 15. No matter what!

Dick Dale

The mother of a trophy wife is not automatically a trophy mother-in-law.

John Grisham

There are absolutely almost perfect people who experience no guilt; they don't know what it is. They simply do what they need to do - or want to do - next. They see nothing wrong with it. They feel no guilt. They express no guilt. And it's not even certain what harm they do.

Mike Nichols

I like to surround myself with people that have dreams and that fight for them every day.

Emeraude Toubia

Dreams are what guide us, art is what defines us, math is what makes it all possible, and love is what lights our way.

Mike Norton

When I was a little girl, I thought I was Sydney Carton in Dickens' 'A Tale of Two Cities.' I don't think anyone else did.

Amy Bloom

Ex with a combineReducers() function todos(state = [], action) { // Somehow calculate it... return nextState } ​ function visibleTodoFilter(state = 'SHOW_ALL', action) { // Somehow calculate it... return nextState } ​ let todoApp = combineReducers({ todos, visibleTodoFilter })

React & Redux

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Ex with a combineReducers() function todos(state = [], action) { // Somehow calculate it... return nextState } function visibleTodoFilter(state = 'SHOW_ALL', action) { // Somehow calculate it... return nextState } let todoApp = combineReducers({ todos, visibleTodoFilter })