This cop checks if the length of a method exceeds some maximum value.
Comment lines can optionally be ignored.
The maximum allowed length is configurable.
This cop checks if the length of a method exceeds some maximum value.
Comment lines can optionally be ignored.
The maximum allowed length is configurable.
This cop checks if the length of a method exceeds some maximum value.
Comment lines can optionally be ignored.
The maximum allowed length is configurable.
This cop checks if the length of a method exceeds some maximum value.
Comment lines can optionally be ignored.
The maximum allowed length is configurable.
This cop checks that the cyclomatic complexity of methods is not higher
than the configured maximum. The cyclomatic complexity is the number of
linearly independent paths through a method. The algorithm counts
decision points and adds one.
An if statement (or unless or ?:) increases the complexity by one. An
else branch does not, since it doesn't add a decision point. The &&
operator (or keyword and) can be converted to a nested if statement,
and ||/or is shorthand for a sequence of ifs, so they also add one.
Loops can be said to have an exit condition, so they add one.
This cop checks if the length of a method exceeds some maximum value.
Comment lines can optionally be ignored.
The maximum allowed length is configurable.
This cop tries to produce a complexity score that's a measure of the
complexity the reader experiences when looking at a method. For that
reason it considers when nodes as something that doesn't add as much
complexity as an if or a &&. Except if it's one of those special
case/when constructs where there's no expression after case. Then
the cop treats it as an if/elsif/elsif... and lets all the when
nodes count. In contrast to the CyclomaticComplexity cop, this cop
considers else nodes as adding complexity.
Example:
def my_method # 1
if cond # 1
case var # 2 (0.8 + 4 * 0.2, rounded)
when 1 then func_one
when 2 then func_two
when 3 then func_three
when 4..10 then func_other
end
else # 1
do_something until a && b # 2
end # ===
end # 7 complexity points
This cop checks if the length of a method exceeds some maximum value.
Comment lines can optionally be ignored.
The maximum allowed length is configurable.
Cognitive Complexity
Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.
A method's cognitive complexity is based on a few simple rules:
Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
Code is considered more complex for each "break in the linear flow of the code"
Code is considered more complex when "flow breaking structures are nested"
Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.
A method's cognitive complexity is based on a few simple rules:
Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
Code is considered more complex for each "break in the linear flow of the code"
Code is considered more complex when "flow breaking structures are nested"
This cops checks if empty lines exist around the arguments
of a method invocation.
Example:
# bad
do_something(
foo
)
process(bar,
baz: qux,
thud: fred)
some_method(
[1,2,3],
x: y
)
# good
do_something(
foo
)
process(bar,
baz: qux,
thud: fred)
some_method(
[1,2,3],
x: y
)
This cop checks for uses of double negation (!!) to convert something
to a boolean value. As this is both cryptic and usually redundant, it
should be avoided.
Example:
# bad
!!something
# good
!something.nil?
Please, note that when something is a boolean value
!!something and !something.nil? are not the same thing.
As you're unlikely to write code that can accept values of any type
this is rarely a problem in practice.
This cop checks for uses of double negation (!!) to convert something
to a boolean value. As this is both cryptic and usually redundant, it
should be avoided.
Example:
# bad
!!something
# good
!something.nil?
Please, note that when something is a boolean value
!!something and !something.nil? are not the same thing.
As you're unlikely to write code that can accept values of any type
this is rarely a problem in practice.
This cop checks for uses of class variables. Offenses
are signaled only on assignment to class variables to
reduce the number of offenses that would be reported.
This cop checks for uses of class variables. Offenses
are signaled only on assignment to class variables to
reduce the number of offenses that would be reported.