Macro
Takes a binding-form and a set of test/expr pairs. Evaluates each test one at a time. If a test returns logical true, cond-let evaluates and returns expr with binding-form bound to the value of test and doesn't evaluate any of the other tests or exprs. To provide a default value either provide a literal that evaluates to logical true and is binding-compatible with binding-form, or use :else as the test and don't refer to any parts of binding-form in the expr. (cond-let binding-form) returns nil.
; clojure/contrib/cond.clj:18 (defmacro cond-let [bindings & clauses] (let [binding (first bindings)] (when-let [[test expr & more] clauses] (if (= test :else) expr `(if-let [~binding ~test] ~expr (cond-let ~bindings ~@more))))))
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