What does the colon mean in this JavaScript snippet (not an object literal)?

Question

I apologize for posting a duplicate-looking question, (I know, that there is a bunch of similar titled questions here), but none of the questions already present seems to suit m

Answer 1

If you'd have read further down the page you linked, you would see why it was written like that.

var func = () => { foo: 1 };

This is an attempt to return an object from a arrow function.

That doesn't work for reasons explained here:

This is because the code inside braces ({}) is parsed as a sequence of statements (i.e. foo is treated like a label, not a key in an object literal). (source)

So the returned value needs to be wrapped in parentheses:

var func = () => ({foo: 1});

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To actually answer your question:

It's a label.

You can't just take the foo: 1 out of context like that.