As I was working on my current Stack constructor, I came across the Stack.formatArn() method. I started to wonder about the difference between using this.formatArn() and cdk.Stack.of(this).formatArn(). After all, shouldn't "this" refer to the stack itself?
Thanks for any help!
I found it interesting that the compiler didn't raise any complaints with either code.
When working within the scope of a Stack instance, both methods are essentially the same.
The Stack.of static method navigates through the construct tree, returning the first instance of a Stack that it comes across. In contrast, within the Stack constructor itself, there is no need for such traversal as simply using Stack.of(this) === this suffices.
The creation of an ARN using a Stack's formatArn method involves calling a slightly tweaked version of the Arn.format static method, which conveniently incorporates the partition, account, and region of the Stack.
Below are different but equally effective ways to construct an ARN within a stack's constructor:
declare const components: ArnComponents
this.formatArn(components)
Stack.of(this).formatArn(components)
Arn.format(components, this)
Arn.format({ ...components, account: this.account, region: this.region })
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