Today I Learned

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Safe Navigation Operator

With the release of Ruby 2.3, the safe navigation operator (&.) is now available. This addition to the Ruby language allows you to collapse all those pesky nil checks into the accessor call they are guarding. Consider this snippet of common Ruby code:

if user && user.authenticate(params[:password])
  # proceed with logged in user

With the safe navigation operator, the predicate can now be collapsed:

if user&.authenticate(params[:password])
  # proceed with logged in user

If user is nil, then the predicate will evaluate to false and the body of the if-statement will be passed over.


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