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length(levels(x)) is the same as nlevels(x), but harder to read.
length(levels(x))
nlevels(x)
length_levels_linter()
best_practices, consistency, readability
linters for a complete list of linters available in lintr.
# will produce lints lint( text = "length(levels(x))", linters = length_levels_linter() ) # okay lint( text = "length(c(levels(x), levels(y)))", linters = length_levels_linter() )
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