peg_sum {piton} | R Documentation |
an example of a Parsing Expression Grammar (PEG) that takes a comma-separated string of digits and sums them together
peg_sum(x)
x |
a vector of strings, each containing a comma-separated set of digits |
a vector of numbers, containing either the sum of
the equivalent element of x
or (if the element
could not be parsed) NA
.
# Simple example
peg_sum("1,2, 5, 91, 34")