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The task is to make a function which returns random number, no build in functions allowed, returned value should be random or pseudo-random and no sequence allowed, no matter what the formula is and how scattered values are.

To simplify task, returned value should be 32-bit integer or float from range [0; 1)

It is code golf, shortest code wins :)

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3
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CoffeeScript (16 bytes)

->new Date%2**32

This is awful random number generator, but if you wait enough, you can get any integer.

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