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Checks if file exists using
vld_string(x) && file.exists(x) && !dir.exists(x)
chk_file(x, x_name = NULL)vld_file(x)
vld_file(x)
The chk_ function throws an informative error if the test fails or returns the original object if successful so it can used in pipes.
chk_
The vld_ function returns a flag indicating whether the test was met.
vld_
The object to check.
A string of the name of object x or NULL.
vld_file(): Validate File Exists
vld_file()
Other chk_files: chk_dir(), chk_ext()
chk_dir()
chk_ext()
# chk_file try(chk_file(tempfile())) # vld_file vld_file(tempfile())
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