JavaScript curly braces with no function or json

Question

Just opened a client's javascript file and the first lines are along the lines of this:

{
    var s_account="blog";
}

Which I don't get. Normally, in my experience, curly braces wrap around a function...

function welcome(){ ...

...or a json JavaScript object

var attributes = { this : "that...

Can anyone tell me why there are curly braces with no text before them or after them? What does it do / what is the point of it?

Answer 1

It's a block and completely pointless unless you label it:

block: {
    var s_account="blog";
    console.log("executed");
    break block;
    console.log("not executed");
}