Avoiding nils in Ruby

avoiding_nils.rb

# Using OpenStruct to mimic an object with the 'posts method'
user = OpenStruct.new(posts: [:post1, :post2])

# Using if user as a nil checker
user.posts if user
# => [:post1, :post2]

# Can be replaced with the safe navigation operator
user&.posts
# => [:post1, :post2]

# What about hashes?
hash = { user: { posts: [:post1, :post2]}}

# Using user[:posts] as a nil checker
hash[:user][:posts] if hash[:user] && hash[:user][:posts]
# => [:post1, :post2]

# Using the Hash#dig method
hash.dig(:user, :posts)

# That's it! 😁