lcom4

LCOM4go

LCOM4go is a tool to compute LCOM4, Lack of Cohesion of Methods metrics ver.4, for golang projects.

Usage

$ ./lcom4go ./...
...

$ ./lcom4go net/http
...

LCOM4 definition

https://objectscriptquality.com/docs/metrics/lack-cohesion-methods-lcom4

Examples

The lcom4 of s0 is 1 because both method1 and method2 use s0.m.

type s0 struct {
	m int
}

func (a s0) method1() int {
	return a.m
}
func (a s0) method2() int {
	return -a.m
}

The lcom4 of s1 is 2 because method3 uses a.n which is not used by method1 and method2.

type s1 struct {
	m int
	n int
}

func (a s1) method1() int {
	return a.m
}
func (a s1) method2() int {
	return -a.m
}
func (a s1) method3() int {
	return -a.n
}

Running the tests

go test ./...

License

This software is released under the MIT License, see the license file.

References

• https://www.aivosto.com/project/help/pm-oo-cohesion.html#LCOM4
• https://kenchon.github.io/cohesive-code
• https://objectscriptquality.com/docs/metrics/lack-cohesion-methods-lcom4
• https://github.com/FujiHaruka/eslint-plugin-lcom
• https://metacpan.org/release/JOENIO/Analizo-1.20.3/source/lib/Analizo/Metric/LackOfCohesionOfMethods.pm
• https://github.com/potfur/lcom
• http://www.isys.uni-klu.ac.at/PDF/1995-0043-MHBM.pdf
• https://github.com/cleuton/jqana