what are the 2 params passed to a reducer? — the state and the action. you need to initialize the state, for example: function todos(state=[ ], action)

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 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.

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> ?

With his black-framed eyeglasses and retro fashion sense, he came off as more geel than chic.

I have a morality. I don't know if it's the best morality. And I do like thinking. If people perceive that as a moral intellectualism, that's fine. That's up to them to decide.

We have to rise above bad fortune. We have to be in the good and enjoy the good, study and work and adventure and friendship and community and love.

It's important that the director and actor have good chemistry, and not just the actors.

There's nothing more frustrating than seeing cynics sit there and say, 'Well, nobody can make any more money because Microsoft and Intel own everything.' Is the software industry mature, or is it embryonic? I would say it's embryonic. There will be a hundred more Microsofts, not just one.

There's a certain pattern that exists with geniuses - an eccentricity, a lack of social graces and an inability to really communicate with mere mortals.

If we dont feel appreciated we dont feel loved.

As I said, I began losing confidence in my instincts, which is tough and very bad for an instinctive person.

We not only romanticize the future; we have also made it into a growth industry, a parlor game and a disaster movie all at the same time.

Having a memoir and a retrospective of your work running almost simultaneously when you're still alive does feel a bit posthumous.

All their teeth are yellow. No tooth-brush ever entered that convent. Brushing one's teeth is at the top of a ladder at whose bottom is the loss of one's soul.

If Republicans want to bring these things up for a vote, I'm letting them know where I stand.

Singing instrumental music is most important because, while you play an instrument, you are singing through the instrument... actually, you are singing inside.

Friendship is one mind in two bodies.

Being disabled should not mean being disqualified from having access to every aspect of life.

There is no better way to quickly buoy hard-pressed homeowners than helping them take advantage of the currently record low fixed mortgage rates and significantly reduce their monthly mortgage payments.

At the time I was diagnosed with Crohn's disease, my doctors told me that I had an incurable illness and they didn't know much about it.

If you're middle aged... where're you going to go to meet someone? You're not going to go to a bar, you're not going to go to a night club; and there are the museums.

Here's my gift-giving rule: Respect your current financial situation.

'Insidious 2' is a direct continuation of the first movie. We literally pick up from where we left off at the end of the first film. And whereas the first movie is a twist on the haunted house genre, the second movie is a twist on the classic domestic thriller.

I've always felt that even though a man was not a Christian, he still has to know the truth some way or another. Or if he was a Christian, he could know the truth. The truth itself doesn't have any name on it to me. And each man has to find this for himself, I think.