Define “cyclic data structures”

Question

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.

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Answer 1

var cyclic = {};
cyclic.somekey = cyclic;
cyclic.another = "Hello world!";

Now you can do this, for example:

alert(cyclic.somekey.somekey.somekey.another);