Hi all,
I'm a little bit confused about the semantic of if-let macro.
Suppose to call it as follows with map destructoring:
(if-let [{key1 :key1} {:key2 "a string"}]
true
false))
It returns true.
But,
(let [{key1 :key1} {:key2 "a string"}]
(if key1
true
false))
returns false.
The macro expansion of the former explains why
(macroexpand-1 '(if-let [{key1 :key1} {:key2 "a string"}] true false))
returns
(clojure.core/let [temp__3971__auto__ {:key2 "a string"}] (if
temp__3971__auto__ (clojure.core/let [{key1 :key1} temp__3971__auto__] true)
false))
the consequence, IMHO, is that I would never suggest to use map restructuring
inside and if-let binding, because the syntax let me think the result its the
opposite of its semantic,
Am I completely wrong?
mimmo
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