How to add a buffer on a point in Open Layers 3

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I am trying to add a buffer around some points shown on a map.I have tried to do something similar back in the days of OL2 and I remember it was not straight forward.

Is there a simple way to do this in OL3? I have found this:

ol.extent.buffer(extent, value, opt_extent)but I am not able to find an example.



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