we can use label and break with simple JavaScript blocks and functions

[lumosmind]

Changed line make me think "we can only use label and break/continue with loops". But this is not totally true. We can use label and break with simple JavaScript blocks and function declarations. So, I tried to make it more clear.

MDN

[iliakan]

@joaquinelio Wow, I never ever saw break used this way.

Maybe it's worth a better explanation?

[iliakan]

Imho, that looks really weird.

If break is allowed to work with blocks, then why non-labelled break doesn't work?

This works:

foo: {
  console.log('face');
  break foo;
  console.log('this will not be executed');
}
console.log('swap');

...But this doesn't (no label):

{
  console.log('face');
  break;
  console.log('this will not be executed');
}
console.log('swap');

[lumosmind]

Imho, that looks really weird.

If break is allowed to work with blocks, then why non-labelled break doesn't work?

This works:

foo: {
  console.log('face');
  break foo;
  console.log('this will not be executed');
}
console.log('swap');

...But this doesn't (no label):

{
  console.log('face');
  break;
  console.log('this will not be executed');
}
console.log('swap');

You are right that's my mistake but it does not effect the changed line. functions and blocks must be labeled when they contain break keyword. I just couldn't write good explanation as MDN.

[iliakan]

Thanks for the note, I changed some phrases to reflect that.

[iliakan]

...Without going much in-detail of that really weird feature =)

[lumosmind]

...Without going much in-detail of that really weird feature =)

yes really weird :) it feels like goto keyword.

[joaquinelio]

I guess more a side effect than a "feature"
they didn't bother

[joaquinelio]

it's not weird, it is beautiful.
Classical break feels like goto.
The concept is cleaner and universal: You label ANY block you are breaking out. (*)
(the for is a block without brackets)

we can forget the "goto but no goto" thing - and its warnings.

...
(*) Is grammar ok?
break jail, like the tool inside the cake

[joaquinelio]

not weird but cool

invoice: {

    for invoiceItems {

        processItem 
        if inPain   break invoice     // truly
    } 
    processPayment     // can break invoice here too
    printing 
    etc

} 

pretty clean