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. safe_deparse_symbol()
only deparses a substituted expressions when possible, which can be much faster
than deparse(substitute()) for those cases where substitute() returns no
valid object name.
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, ...)
safe_deparse_symbol(x)
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.
A (character) vector, or for some functions may also be a data frame.
Currently not used.
Logical, if TRUE and x is a data frame or list,
only processes character vectors.
Logical, if missing values should be removed from the input.
trim_ws(" no space! ")
n_unique(iris$Species)
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