Thread-first, thread-last and "dot" form

Why do both of these expressions give the same result?

> (macroexpand-all '(->> "string" (.charAt)))

(. "string" charAt)

> (macroexpand-all '(-> "string" (.charAt)))

(. "string" charAt)

Isn't "->>" macro supposed to insert "string" as the last element in the list?

Solution

It expands first to (.charAt "string"), which indeed is last. Then that form further expands to (. "string" charAt).

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