literal_coercion_linter: Require usage of correctly-typed literals over literal...

In lintr: A 'Linter' for R Code

Require usage of correctly-typed literals over literal coercions

Description

as.integer(1) (or rlang::int(1)) is the same as 1L but the latter is more concise and gets typed correctly at compilation.

Usage

literal_coercion_linter()

Details

The same applies to missing sentinels like NA – typically, it is not necessary to specify the storage type of NA, but when it is, prefer using the typed version (e.g. NA_real_) instead of a coercion (like as.numeric(NA)).

Tags

best_practices, consistency, efficiency

See Also

linters for a complete list of linters available in lintr.

Examples

# will produce lints
lint(
  text = "int(1)",
  linters = literal_coercion_linter()
)

lint(
  text = "as.character(NA)",
  linters = literal_coercion_linter()
)

lint(
  text = "rlang::lgl(1L)",
  linters = literal_coercion_linter()
)

# okay
lint(
  text = "1L",
  linters = literal_coercion_linter()
)

lint(
  text = "NA_character_",
  linters = literal_coercion_linter()
)

lint(
  text = "TRUE",
  linters = literal_coercion_linter()
)

lintr documentation built on April 12, 2025, 1:42 a.m.