[R] Parsing JSON records to a dataframe

[Jeroen Ooms]

What is the most efficient method of parsing a dataframe-like structure that
has been json encoded in record-based format rather than vector based. For
example a structure like this:

[ {"name":"joe", "gender":"male", "age":41}, {"name":"anna",
"gender":"female", "age":23} ]

RJSONIO parses this as a list of lists, which I would then have to apply
as.data.frame to and append them to an existing dataframe, which is terribly
slow. 


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