Serverless Programming Cookbook

Intrinsic functions

Intrinsic functions are built-in functions provided by AWS to use within a template for dynamically adding values. Common intrinsic functions used within CloudFormation templates are as follows: Fn::Base64, Fn::Cidr, Fn::FindInMap, Fn::GetAtt, Fn::GetAZs, Fn::ImportValue, Fn::Join, Fn::Select, Fn::Split, Fn::Sub, and Ref.

CloudFormation also supports the following conditional functions: Fn::And, Fn::Equals, Fn::If, Fn::Not, and Fn::Or.

We can specify the functions in the standard forms as mentioned here or in the short-hand form (for instance, !Base64, !Cidr, !Ref, and so on) if you are using YAML. We used the standard syntax for this recipe for reference, but will use the short-hand syntax in later recipes.

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