LowFile-scopeRuby Plug & play

Freeze constants to prevent modification

Freeze constant objects (arrays/hashes/strings) to avoid accidental mutation at runtime.

Why this matters

Preserves invariants and prevents subtle bugs.

Side-by-side examples engineers can pattern-match during review.

Avoid

ALLOWED = %w[a b c]
ALLOWED << 'd'

Prefer

ALLOWED = %w[a b c].freeze

Bad

HASH = {a: 1}

Good

HASH = {a: 1}.freeze

From the same buckets as this rule.

Critical
Avoid Duplicating String Literals
Store repeated string literals in constants or variables to improve maintainability and reduce redundancy.
duplication-complexitymaintainability
Critical
Avoid Empty Methods
Detect methods that have an empty body. If a method is empty, ensure that a comment is present explaining why it remains unimplemented.
maintainabilityreadability-refactor
Critical
Avoid modifying built-in prototypes
Detect modifications to built-in prototypes. Modifying built-in objects can lead to compatibility issues and unexpected behavior. Recommend creating helper functions instead.
maintainabilitysecurity-hardening