Pattern: Use of invertible unless
Issue: -
Checks for usages of unless which can be replaced by if with inverted condition. Code without unless is easier to read, but that is subjective, so this cop is disabled by default.
Methods that can be inverted should be defined in InverseMethods. Note that the relationship of inverse methods needs to be defined in both directions.
# bad (simple condition)
foo unless !bar
foo unless x != y
foo unless x >= 10
foo unless x.even?
# good
foo if bar
foo if x == y
foo if x < 10
foo if x.odd?
# bad (complex condition)
foo unless x != y || x.even?
# good
foo if x == y && x.odd?
# good (if)
foo if !condition