Unbox a vector or data frame
This function marks an atomic vector or data frame as a
singleton, i.e.
a set with exactly 1 element. Thereby, the value will not turn into an
array when encoded into JSON. This can only be done for
atomic vectors of length 1, or data frames with exactly 1 row. To automatically
unbox all vectors of length 1 within an object, use the auto_unbox argument
in toJSON.
unbox(x)
x |
atomic vector of length 1, or data frame with 1 row. |
It is usually recommended to avoid this function and stick with the default
encoding schema for the various R classes. The only use case for this function
is if you are bound to some specific predefined JSON structure (e.g. to
submit to an API), which has no natural R representation. Note that the default
encoding for data frames naturally results in a collection of key-value pairs,
without using unbox.
Returns a singleton version of x.
toJSON(list(foo=123)) toJSON(list(foo=unbox(123))) # Auto unbox vectors of length one: x = list(x=1:3, y = 4, z = "foo", k = NULL) toJSON(x) toJSON(x, auto_unbox = TRUE) x <- iris[1,] toJSON(list(rec=x)) toJSON(list(rec=unbox(x)))
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