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nil coalescing operator returns the left side if it's non-nil, otherwise it returns the right side. You can also use it like this to return a default value: (string ?? "").
nil? will only return true if the object itself is nil. That means that an empty string is NOT nil and an empty array is NOT nil.
The second clause does not need a !variable.nil? check—if evaluation reaches that point, variable.nil is guaranteed to be false (because of short-circuiting).
This should be sufficient:
variable = id if variable.nil? || variable.empty?
If you're working with Ruby on Rails, Object.blank? solves this exact problem:
An object is blank if it’s false, empty, or a whitespace string. For example,
""," ",nil,[], and{}are all blank.
If you're in Rails, .blank? should be the method you are looking for:
a = nil
b = []
c = ""
a.blank? #=> true
b.blank? #=> true
c.blank? #=> true
d = "1"
e = ["1"]
d.blank? #=> false
e.blank? #=> false
So the answer would be:
variable = id if variable.blank?
variable = id if variable.to_s.empty?
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