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.

why JSX?

can you have more than one root dom nodes?

How do you render an element into the dom?

Are React elements mutable?

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

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

How do you add local state to a class?

why are lifecycle hooks important?

Does redux work only with react?

Core concepts: actions reducers

what's an action for redux?

What's the purpose of a reducer?

what are the 2 params passed to a reducer?

what are the advantages of a single store?

How is Redux different from Flux?

advantage of immutability in Redux?

Redux architecture revolves around a strict unidirectional data flow.

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)

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

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

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

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.

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.

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

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:

How do you use <provider> ?

Boys like it when you're mean. That's what I'm best at. I make them feel so bad about themselves, all out of fun.

I've never lost perspective on who I am. Well, maybe briefly, but generally I'm pretty balanced.

We Egyptians reject any kind of assault or insult against our prophet.

Our most important task as a nation is to make sure all our young people can achieve their dreams.

I read so much data. There's so much information that comes my way. And there's got to be a way for me to delegate more.

You can often tell the difference between a singer that grows up in the church and one that just can sing. There's a connection to love and support and care. You feel good when you hear it. You feel the people have so much conviction in what they're singing. They believe it, so you believe it.

I don't know if I have a technique. I'm just trying to remember the words.

We don't need mandatory, non-sectarian prayers read over the loudspeaker to 'put God back in schools.' God never left the schools. God is still at work through the hundreds of thousands of gifted teachers and administrators, committed parents, and passionate volunteers who seek to help give our children 'a future with hope.'

It appears to me that almost any man may like the spider spin from his own inwards his own airy citadel.

The Internet is a tool, a technology, and we like to say that it has all of these properties, but really, it's just a place where our writing is.

Oppression does not make for hearts as big as all outdoors. Oppression makes us big and small. Expressive and silenced. Deep and dead.

I started out on photography accidentally. A policeman came to a stop at the end of my street, and a guy knifed him at the end of my street. That's how I became a photographer. I photographed the gangs that I went to school with.

In every creepy movie ever made the barn is the prime nesting ground for the things you dont know youre looking for and always regret finding.

My goal is to create friend machines. Friendly genius machines. Machines with genius capabilities.

People who work crossword puzzles know that if they stop making progress, they should put the puzzle down for a while.

The basic answer is that I wasn't happy or fulfilled by the job I had and I wanted my life to mean something to me, so I searched my life experience and realized that acting and performing were activities that I enjoyed all aspects of.

I believe the greatest asset a head of state can have is the ability to get a good night's sleep.

New Yorkers, by reputation, are fast-talking, assertive and easily annoyed; I fit right in.

Religious symbols should be visible in public space, in a dignified and non-provocative manner. Christmas trees here, Jewish menorahs there and, further along, a minaret - these symbols represent human life in all its diversity.

Risks are a measure of people. People who don't take them are trying to preserve what they have. Some risks have a future, and some people call them wrong. But being right may be like walking backwards, proving where you've been.

I get a lot of mail from boys in detention centers, including one from a center where they only had a few copies of my novel. They had a deal with each other that they'd read a couple of chapters and then slide it under the door to the next guy. I think that's very cool.