HighFile-scopeRuby Plug & play

Protect against NoMethodError on nil objects

Guard early or use safe navigation when dereferencing possibly-nil data.

Why this matters

Avoids crashes and clarifies control flow.

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

Avoid

order.customer.name.downcase

Prefer

return unless order&.customer&.name
name = order.customer.name.downcase

Bad

obj.child.value

Good

return unless obj&.child&.value

From the same buckets as this rule.

Critical
Avoid equality operators in loop termination conditions
Check if loops use equality operators (== or !=) in termination conditions. These can lead to infinite loops if the condition is never met exactly. Instead, use relational operators like < or > for safer loop termination.
error-handlingreadability-refactor
Critical
Avoid Returning Null in Non-Async Task Methods
Returning null from a Task or Task<T> method causes a NullReferenceException if awaited. Use Task.CompletedTask or Task.FromResult<T>(null) instead.
error-handlingreadability-refactor+1
Critical
Avoid Using Boolean Expressions in `except` Statements
Detect `except` clauses that use `or` or `and` to catch multiple exceptions. This does not work as intended. Recommend using a tuple of exceptions instead.
error-handlingstack-python