Need explain on this code, state and setState

Hi, I’m on React but still struggle with state and setState. Already read the docs over the internet but there’s nothing a simple one (or maybe my brain just not good)

Please anyone can explain?
Sorry for bad english

Look at the comment for this code.

 constructor(props) {
    this.state = {  // This part, is this an object?
      count: 0     // like equal to 
                  // const state = {count: 0}?
   // I believe this one below is the initialize part 
  // like const increment
this.increment = this.increment.bind(this) 

// Since you already initialize it above, then you can use this one below

What’s the difference between these two method?

something() {
something() {
    this.setState(state => ({ // where's the state refer to? on the constructor?

Thank you everyone, I believe I can’t go forward until I fully understand this state and setState.

For you to understand class components, you need to understand Classes. I suggest you look at This MDN doc. on Classes to learn more about classes and then return to the react tutorials.