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Block usages like !(x == y) where a direct relational operator is appropriate

Source: R/comparison_negation_linter.R
comparison_negation_linter.Rd

!(x == y) is more readably expressed as x != y. The same is true of other negations of simple comparisons like !(x > y) and !(x <= y).

Usage

comparison_negation_linter()

See also

linters for a complete list of linters available in lintr.

Tags

consistency, readability

Examples

# will produce lints
lint(
  text = "!x == 2",
  linters = comparison_negation_linter()
)
#> <text>:1:1: warning: [comparison_negation_linter] Use x != y, not !(x == y).
#> !x == 2
#> ^~~~~~~

lint(
  text = "!(x > 2)",
  linters = comparison_negation_linter()
)
#> <text>:1:1: warning: [comparison_negation_linter] Use x <= y, not !(x > y).
#> !(x > 2)
#> ^~~~~~~~

# okay
lint(
  text = "!(x == 2 & y > 2)",
  linters = comparison_negation_linter()
)
#> ℹ No lints found.

lint(
  text = "!(x & y)",
  linters = comparison_negation_linter()
)
#> ℹ No lints found.

lint(
  text = "x != 2",
  linters = comparison_negation_linter()
)
#> ℹ No lints found.