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Add rule against memoizing possibly falsely values #195

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Add rule against memoizing possibly falsely values #195

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15 changes: 15 additions & 0 deletions README.md
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Expand Up @@ -373,6 +373,21 @@ documentation](https://docs.rubocop.org/rubocop/configuration.html#inheriting-co
@enabled = true unless defined?(@enabled)
~~~

* Avoid using `||=` to memoize possibly falsey (`false` or `nil`) values.

~~~ ruby
# bad - will repeat lookup each time if it returns nil
def existing_record
@existing_record ||= expensive_lookup_that_might_return_nil
end

# good
def existing_record
return @existing_record if defined?(@existing_record)
@existing_record = expensive_lookup_that_might_return_nil
end
~~~

* Avoid spaces between a method name and the opening parenthesis.

* Prefer the lambda literal syntax over `lambda`.
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