Prefer map
over collect
. Open
MIME::Types.type_for(@filepath).collect(&:content_type)
- Read upRead up
- Exclude checks
This cop enforces the use of consistent method names from the Enumerable module.
Unfortunately we cannot actually know if a method is from Enumerable or not (static analysis limitation), so this cop can yield some false positives.
Use File.size(@filepath).zero?
instead of File.size(@filepath) == 0
. Open
File.exist?(@filepath) && File.size(@filepath) == 0
- Read upRead up
- Exclude checks
This cop checks for usage of comparison operators (==
,
>
, <
) to test numbers as zero, positive, or negative.
These can be replaced by their respective predicate methods.
The cop can also be configured to do the reverse.
The cop disregards #nonzero?
as it its value is truthy or falsey,
but not true
and false
, and thus not always interchangeable with
!= 0
.
The cop ignores comparisons to global variables, since they are often
populated with objects which can be compared with integers, but are
not themselves Interger
polymorphic.
Example: EnforcedStyle: predicate (default)
# bad
foo == 0
0 > foo
bar.baz > 0
# good
foo.zero?
foo.negative?
bar.baz.positive?
Example: EnforcedStyle: comparison
# bad
foo.zero?
foo.negative?
bar.baz.positive?
# good
foo == 0
0 > foo
bar.baz > 0
Freeze mutable objects assigned to constants. Open
EMPTY_TYPE = "inode/x-empty"
- Read upRead up
- Exclude checks
This cop checks whether some constant value isn't a mutable literal (e.g. array or hash).
Example:
# bad
CONST = [1, 2, 3]
# good
CONST = [1, 2, 3].freeze
Freeze mutable objects assigned to constants. Open
SENSIBLE_DEFAULT = "application/octet-stream"
- Read upRead up
- Exclude checks
This cop checks whether some constant value isn't a mutable literal (e.g. array or hash).
Example:
# bad
CONST = [1, 2, 3]
# good
CONST = [1, 2, 3].freeze