On 31 May 2010, at 10:28, Michael Jaaka wrote:
Is that let expression helps?
(let [word (*cfg* :word)]
(filter #(= word %) [ "tom" "eat" ]))
or this is exactly the same
(filter #(= (*cfg* :word) %) [ "tom" "eat" ])
note that *cfg* is a thread binded hash map
The two expressions are equivalent. However, there is a difference
when you use let outside of a function definition:
(defn filter-words [words]
(filter #(= (*cfg* :word) %) words))
This looks the value corresponding to the key :word at each function
call.
(let [word (*cfg* :word)]
(defn filter-words [words]
(filter #(= word %) words)))
This looks up the value corresponding to :word once, when the function
is defined, and uses that same value whenever the function is called.
Konrad.
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