I try to find out the purpose of underscore in method argument but not find any reason. Like there is a method

def eligible(user)
end

and same method but with an underscore in argument

def eligible(_user)
end

whats the difference between them

CodePudding user response：

It's just code convention to underscore a variable if you're not gonna use it later on. It has no meaning otherwise.

Use _ for unused variables.

from ... https://clearwater.readthedocs.io/en/stable/Clearwater_Ruby_Coding_Guidelines.html#naming

Also see this for further reading on style preferences. https://github.com/rubocop/ruby-style-guide