TODO: Mention and + or and && + || and when to use them.
# The 'and' + 'or' operators only work properly with booleans
true and false # => false
false or true # => true
# 🚨 They throw a BadBooleanError exception for non-boolean values
nil and false # => BadBooleanError
nil or false # => BadBooleanError
# ⚠️ Except when the last argument is non-boolean.
# In these cases, they return the non-boolean value instead.
true and nil # => nil
false or :foo # => :foo
# ✅ The safer option is to use '&&' and '||' for everything
# outside of Ecto queries.
true && false # => false
false || true # => true
# ⚠️ Also these operators don't always return 'true' or 'false'
# But they don't throw an exception for non-boolean values.
nil && false # => nil
false || :foo # => :foo
# 🚀 This doesn't matter for Elixir though, because it evaluates
# any value other than 'false' or 'nil' as "truthy". As long as
# your operators return a truthy or falsey value, you're safe.
if nil, do: "true", else: "false" # => "false"
if :foo, do: "true", else: "false" # => "true"
# ➡️ So, always use '&&' + '||' outside of Ecto queries!
