The digest2int function calculates integer hash of an arbitrary string.
This is useful for randomized experiments, feature hashing, etc.
digest2int(x, seed = 0L)An arbitrary character vector.
an integer for algorithm initial state. Function will produce different hashes for same input and different seed values.
The digest2int function returns integer vector of the same length
as input vector x.
Jenkins's one_at_a_time hash:
https://en.wikipedia.org/wiki/Jenkins_hash_function#one_at_a_time.
# NOT RUN {
current <- digest2int("The quick brown fox jumps over the lazy dog", 0L)
target <- 1369346549L
stopifnot(identical(target, current))
# }