Testing for empty or nil-value string

Question

I m trying to set a variable conditionally in Ruby   I need to set it if the variable is nil or empty  0 length string    I ve come up with the following   variable   id if variable nil       variable nil   amp  amp  variable empty     While it works  it doesn t seem very Ruby-like to me   Is the a more succinct way of expressing the above

User · Answer

If you re in Rails   blank  should be the method you are looking for   a   nil b      c       a blank     gt  true b blank     gt  true c blank     gt  true  d    1  e     1    d blank     gt  false e blank     gt  false   So the answer would be   variable   id if variable blank

User · Answer

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

User · Answer

variable   id if variable to s empty

[ruby-on-rails] Testing for empty or nil-value string

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