str_dup() duplicates the characters within a string, e.g.
str_dup("xy", 3) returns "xyxyxy".
str_dup(string, times)A character vector the same length as string/times.
Input vector. Either a character vector, or something coercible to one.
Number of times to duplicate each string.
fruit <- c("apple", "pear", "banana")
str_dup(fruit, 2)
str_dup(fruit, 1:3)
str_c("ba", str_dup("na", 0:5))
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