I have (in memory) a set of geojson files and would like to execute user defined math function on the properties of the features inside these geojson objects.
E.g. : SUM([height]) AVG([temperature]) * 100 COUNT([users]>10) etc.
these parameters ([height],etc) are the properties of the features.
I looked at mathjs, but as far as I can see it cannot use existing objects.