Concatenate vectors after converting to character and removing
NA values. See
paste2(..., sep = " ", collapse = NULL, na.rm = TRUE)
one or more R objects, to be converted to character vectors.
a character string to separate the terms.
an optional character string to separate the results.
logical, indicating whether
NA values should be stripped
A character vector of the concatenated values.
paste2("word", NA) #>  "word"