What's difference between class_eval and module_eval ?

[Kyung won Cheon]

-- test.rb --

module M
def self.test
puts "M.test is called"
end
end

M.test
M.instance_eval { test }
M.class_eval { test }
M.module_eval { test }


--- result ---

M.test is called
M.test is called
M.test is called
M.test is called

 

[Peña, Botp]

RnJvbToga2RyZWFtOTVAZ21lcmNlLmNvLmtyIFttYWlsdG86a2RyZWFtOTVAZ21lcmNlLmNvLmty
XSANCiMgV2hhdCdzIGRpZmZlcmVuY2UgYmV0d2VlbiBjbGFzc19ldmFsIGFuZCBtb2R1bGVfZXZh
bCA/DQoNCm5vbmUuIG9uZSBpcyBqdXN0IGFuIGFsaWFzIG9mIHRoZSBvdGhlci4NCg==