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Is there any difference between
obj = {'foo': 'bar'}
and
obj = {foo: 'bar'}
I have noticed that you can’t use - in the key when I don’t use the quotes. But does it actually make a difference? If yes, which?
No, the quotes do not make a difference (unless, as you noted, you want to use a key that’s not a valid JavaScript identifier).
As a side note, the JSON data exchange format does require double quotes around identifiers (and does not allow single quotes).