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ruby

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else
something_else
end
----
=== Semicolon in `if` [[no-semicolon-ifs]]
Do not use `if x; ...`. Use the ternary operator instead.
[source,ruby]
----
# bad
result = if some_condition; something else something_else end
# good
result = some_condition ? something : something_else
----
=== `case` vs `if-else` [[case-vs-if-else]]
Prefer `case` over `if-elsif` when compared value is the same in each clause.
[source,ruby]
----
# bad
if status == :active
perform_action
elsif status == :inactive || status == :hibernating
check_timeout
else
final_action
end
# good
case status
when :active
perform_action
when :inactive, :hibernating
check_timeout
else
final_action
end
----
=== Returning Result from `if`/`case` [[use-if-case-returns]]
Leverage the fact that `if` and `case` are expressions which return a result.
[source,ruby]
----
# bad
if condition
result = x
else
result = y
end
# good
result =
if condition
x
else
y
end
----
=== One-line Cases [[one-line-cases]]
Use `when x then ...` for one-line cases.
NOTE: The alternative syntax `when x: ...` has been removed as of Ruby 1.9.
=== Semicolon in `when` [[no-when-semicolons]]
Do not use `when x; ...`. See the previous rule.
=== Semicolon in `in` [[no-in-pattern-semicolons]]
Do not use `in pattern; ...`. Use `in pattern then ...` for one-line `in` pattern branches.
[source,ruby]
----
# bad
case expression
in pattern; do_something
end
# good
case expression
in pattern then do_something
end
----
=== `!` vs `not` [[bang-not-not]]
Use `!` instead of `not`.
[source,ruby]
----
# bad - parentheses are required because of op precedence