Define "cyclic data structures"

Posted by Earlz on Stack Overflow See other posts from Stack Overflow or by Earlz
Published on 2010-06-09T22:09:27Z Indexed on 2010/06/09 22:12 UTC
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JavaScript

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JSON

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data-structures

At the JSON site it says

JSON does not support cyclic data structures, so be careful to not give cyclical structures to the JSON stringifier.

What does it mean by this? Can someone give me an example of such a data structure in Javascript?

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