date_time <- "2018-10-12 16:12:28 PDT"
d <- rep(date_time, 3)
f1 <- function(d) {
lubridate::ymd_hms(d)
}
str(f1(d))
## POSIXct[1:3], format: "2018-10-12 16:12:28" "2018-10-12 16:12:28" ...
f2 <- wrapr::VectorizeM(f1,
SIMPLIFY = FALSE,
UNLIST = TRUE)
str(f2(d))
## POSIXct[1:3], format: "2018-10-12 16:12:28" "2018-10-12 16:12:28" ...
# generate lots of date strings, but only from a few
# dates
d <- rep(f1(date_time), 1000000)
d <- d + sample.int(100, size = length(d), replace = TRUE)
d <- as.character(d)
timings <- microbenchmark::microbenchmark(f1(d),
f2(d))
print(timings)
## Unit: milliseconds
## expr min lq mean median uq max neval cld
## f1(d) 164.3644 204.9510 238.6316 226.5286 271.1638 362.0206 100 a
## f2(d) 445.0025 475.5262 523.4344 492.2326 540.6395 1002.9361 100 b
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