AWS CloudFormation Concepts Intrinsic Functions
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External
Internal
Ref
The intrinsic function Ref returns the value of the specified parameter or resource. When a parameter logical name is specified, it returns the value of the parameter. When a resource logical name is specified, it returns a value that can be typically used to refer to that resource, such as a physical ID.
Join
!Join ['-', [ a, b, c ]]
returns "a:b:c"
Split
!Split ['.', "www.example.com"]
returns ["www", "example", "com"].