Left to Right Binding Order in Let Form

Question

I am working through an example of destructuring in the Joy of Clojure, and I cam across an example that surprised me. Both of these produce the same output:

(let [range-vec (vec (range 10)) [a b c & more :as all] range-vec]
        (println "a b c: " a b c)
        (println "more: " more)
        (println "all: " all))

(let [range-vec (vec (range 10))]
    (let [[a b c & more :as all] range-vec]
        (println "a b c: " a b c)
        (println "more: " more)
        (println "all: " all)))

Now initially the first form countered my intuition because, thinking that binding and precedence happened from left to right, that range-vec would not be defined before assigning to "all". I the second form, range-vec has already been defined, and then assigned to all in the second let statement, which seems to follow the rules I know so far. When do I know when a symbol has been bound and the order in which that happens?

Answer 1

According to the Clojure documentation:

The bindings are sequential, so each binding can see the prior bindings.

Are you a Lisp or Scheme programmer? Clojure let is like let* in CL or Scheme in this regard.