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.

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.

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.

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> ?

Perhaps many of the perplexing problems of the new music could be put into a new light if we were to reintroduce the ancient idea of music being a reflection of nature.

Guys have to look up to somebody. Everybody needs to have their own role and somebody has to be the star.

We need Hollywood to make movies and television shows about sexy female engineers.

Gemmell's name guarantees a satisfying story and a thumping good read. I recommend all his heroic creations - 'Druss the axeman,' 'the Jerusalem man,' among others - but my favourite has to be 'Waylander': Clint Eastwood with a crossbow and the same 'Make my day, punk' attitude.

By the time I sat down to write 'Family Pictures,' I hadn't written anything in almost two years, and writing, I have discovered, is a muscle: if it isn't exercised, it will atrophy.

I focused on where she was from of course, her voice and her history, her relationship with God - her religion. This was probably the strongest relationship she has had, really. She never seemed to maintain close relationships with husbands.

We have made mistakes. In our haste to do all things for all people, we did not foresee the full consequences of our actions. And when the people raised their voices, we didn't hear. But our deafness was only a temporary condition, and not an irreversible condition.

Forgiveness is divine, but never pay full price for late pizza.

Setting an example is not the main means of influencing others; it is the only means.

Or the Department of Education and another ministry were worried about duplication of effort, so what did they do? They set up two committees to look into duplication and neither knew what the other was up to. It really is a world beyond parody.

In the past, the greatest weapon the white man has had has been his ability to divide and conquer. If I take my hand and slap you, you don't even feel it. It might sting you because these digits are separated. But all I have to do to put you back in your place is bring those digits together.

Government without a constitution is a power without a right.

Celebrity is a gift. I'm very lucky.

Letting the greens dictate your energy choices, whether it's halting the XL Pipeline or fracking in New York, isn't just bad economics. It can also leave your rivals and enemies controlling your energy destiny.

When thousands of men and women work full time but need food stamps to put food on their tables, when they can't get health benefits, when they can't get paid sick days, then we must do whatever we can to stand up for them.

I'm drawn to a good story, really, as I hope most people are. For me, it's the story that's going to stay with you eventually, not necessarily the genre. I go to watch a film because of the story, not because it was a Western or a comedy.

Your soul may belong to Jesus, but your ass belongs to the marines.

The more brutal it gets in the working world, the more appealing the prospect of having someone at home creating a sanctuary becomes. Increasingly couples, particularly with children, are making that tough choice, with one or other partner electing to embrace domestic duties while the other brings home the cash.

Economy is the method by which we prepare today to afford the improvements of tomorrow.

In a world of complex threats, our security and leadership depends on all elements of our power - including strong and principled diplomacy.

Both my parents were agnostic. My mother was kind of a Buddhist. She had some spiritual tendencies, but they were kind of flaky - New Agey, you know? Which is partly why I'm suspicious of that sort of thing. I'm skeptical of any spiritual practice that doesn't involve other people and doesn't involve some sort of consistent tradition.