(aws-cdk-lib.Fn): Support Fn::ForEach

[alFReD-NSH]

Describe the feature

Fn::ForEach is a new function that is added to cloudformation.

Use Case

Creating multiple resources based on Cloudformation template parameter. I'm deploying CDK generated templates to Service Cataloge.

Proposed Solution

ForEach function in aws-cdk-lib.Fn

Other Information

No response

Acknowledgements

• [X] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

CDK version used

v2.96.2

Environment details (OS name and version, etc.)

Any

[pahud]

Thank you for the feature request and PR! This is an awesome feature!

[alFReD-NSH]

Giving this more thoughts, we'll have to think off how the interface would be. This could be applied to resources, conditions and outputs.

[alFReD-NSH]

Here's two different possibilities, we could create resources for it:

1. Inside a callback function, which makes it somewhat functional programming looking:

    new ForEach(this, 'Queues', queueNames, (scope: Construct, variable: string)  => {
        new sqs.Queue(scope, 'Test', {
            queueName: Token.asString(variable)
        })
    });

2. Or use the class properties:

    const forEach = new ForEach(this, 'Queues', queueNames);
    new sqs.Queue(forEach.childrenScope, 'Test', {
      queueName: Token.asString(forEach.identifier)
    });

It would be nice to gather more input from CDK core members.

[matheushent]

This feature request is open for quite a while... any prevision on when it is coming?