T and F symbol linter

Although they can be synonyms, avoid the symbols T and F, and use TRUE and FALSE, respectively, instead. T and F are not reserved keywords and can be assigned to any other values.

Usage

T_and_F_symbol_linter()

See also

• linters for a complete list of linters available in lintr.

• https://style.tidyverse.org/syntax.html#logical-vectors

Tags

best_practices, consistency, default, readability, robustness, style

Examples

# will produce lints
lint(
  text = "x <- T; y <- F",
  linters = T_and_F_symbol_linter()
)
#> <text>:1:7: style: [T_and_F_symbol_linter] Use TRUE instead of the symbol T.
#> x <- T; y <- F
#>      ~^
#> <text>:1:15: style: [T_and_F_symbol_linter] Use FALSE instead of the symbol F.
#> x <- T; y <- F
#>              ~^

lint(
  text = "T = 1.2; F = 2.4",
  linters = T_and_F_symbol_linter()
)
#> <text>:1:2: style: [T_and_F_symbol_linter] Don't use T as a variable name, as it can break code relying on T being TRUE.
#> T = 1.2; F = 2.4
#> ~^
#> <text>:1:11: style: [T_and_F_symbol_linter] Don't use F as a variable name, as it can break code relying on F being FALSE.
#> T = 1.2; F = 2.4
#>          ~^

# okay
lint(
  text = "x <- c(TRUE, FALSE)",
  linters = T_and_F_symbol_linter()
)
#> ℹ No lints found.

lint(
  text = "t = 1.2; f = 2.4",
  linters = T_and_F_symbol_linter()
)
#> ℹ No lints found.