Nothing to do with "Threads" as in the threads in a process, concurrency, parallelism and all that.
It seems similar to the pipe operator in Elixir, to chain function calls. Here's a small example:
(->
["list" "of" "strings"]
first
clojure.string/capitalize)
;; => "List"
;; equivalent to:
(clojure.string/capitalize (first ["list" "of" "strings"]))and
(->>
["list" "of" "strings"]
(take 2)
(map clojure.string/join))
;; => ("list" "of")
;; equivalent to:
(map clojure.string/join (take 2 ["list" "of" "strings"]))Docs:
- https://clojure.org/guides/threading_macros
- https://clojure.github.io/clojure/clojure.core-api.html#clojure.core/-%3E
There are other functions, such as as->, which I know nothing about at this point