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let and {}

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I am sure this is explained in multiple places, but the amount of 
novelties that have been introduced since I last looked at JS seriously 
(many many years ago) is confusing me endlessly and I am no longer sure 
about what I know and what I don't know.

Please bear with me if I ask this honorable forum:

Inside a class:

         this.state = {
             gameState: "ready",
             wrongGuesses: [],
             correctGuesses: []
         };

            :

         let { wrongGuesses, correctGuesses } = this.state;

Questions:

0) what's the meaning of curly braces there?

1) why does this work? i.e. why are wrongGuesses and correctGuesses 
being assigned correctly?

2) what's the scope of wrongGuesses and correctGuesses?

3) why isn't this.gameState "interfering" with what needs to be asigned 
to what?

4) is this an ES5 or ES6 feature?

Thanks a lot

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let and {} Luca <luca@please.nospam.it> - 2019-01-03 10:46 -0500
  Re: let and {} Jon Ribbens <jon+usenet@unequivocal.eu> - 2019-01-03 16:31 +0000
    Re: let and {} Luca <please_no@spam.it> - 2019-01-03 13:13 -0500
      Re: let and {} Jon Ribbens <jon+usenet@unequivocal.eu> - 2019-01-03 20:07 +0000
        Re: let and {} Luca <luca@please.nospam.it> - 2019-01-03 23:45 -0500
  Re: let and {} Martin Honnen <martin.honnen@gmx.de> - 2019-01-03 17:32 +0100
    Re: let and {} Luca <please_no@spam.it> - 2019-01-03 13:14 -0500

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