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Usage like class(x) == "character" is prone to error since class in R is in general a vector. The correct version for S3 classes is inherits(): inherits(x, "character"). Often, class k will have an is. equivalent, for example is.character() or is.data.frame().

Usage

class_equals_linter()

Details

Similar reasoning applies for class(x) %in% "character"

See also

linters for a complete list of linters available in lintr.