Small helper functions — trim

Collection of small helper functions. trim_ws() is an efficient function to trim leading and trailing whitespaces from character vectors or strings. n_unique() returns the number of unique values in a vector. safe_deparse() is comparable to deparse1(), i.e. it can safely deparse very long expressions into a single string.

Usage

trim_ws(x, ...)

# S3 method for data.frame
trim_ws(x, character_only = TRUE, ...)

n_unique(x, ...)

# S3 method for default
n_unique(x, na.rm = TRUE, ...)

safe_deparse(x, ...)

Arguments

x: A (character) vector, or for some functions may also be a data frame.
...: Currently not used.
character_only: Logical, if TRUE and x is a data frame or list, only processes character vectors.
na.rm: Logical, if missing values should be removed from the input.

Value

For a vector, n_unique always returns an integer value, even if the input is NULL (the return value will be 0 then). For data frames or lists, n_unique() returns a named numeric vector, with the number of unique values for each element.

Examples

trim_ws("  no space!  ")
#> [1] "no space!"
n_unique(iris$Species)
#> [1] 3