Named parameters: Difference between revisions
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Clojure doesn't have built-in support for named or keyword arguments, but you can use destructuring to achieve a similar effect. |
Clojure doesn't have built-in support for named or keyword arguments, but you can use destructuring to achieve a similar effect. |
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<lang |
<lang clojure>(defn foo [& opts] |
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(let [opts (merge {:bar 1 :baz 2} (apply hash-map opts)) |
(let [opts (merge {:bar 1 :baz 2} (apply hash-map opts)) |
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{:keys [bar baz]} opts] |
{:keys [bar baz]} opts] |
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[bar baz]))</lang> |
[bar baz]))</lang> |
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Clojure 1.2 supports destructuring of trailing arguments as a map: |
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<lang clojure>(defn foo [& {:keys [bar baz] :or {bar 1, baz 2}}] |
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[bar baz])</lang> |
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You can also use <code>defnk</code> from <code>clojure.contrib.def</code>, which is a macro that works similarly. |
You can also use <code>defnk</code> from <code>clojure.contrib.def</code>, which is a macro that works similarly. |
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<lang |
<lang clojure>(use 'clojure.contrib.def) |
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(defnk foo [:bar 1 :baz 2] |
(defnk foo [:bar 1 :baz 2] |
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[bar baz])</lang> |
[bar baz])</lang> |
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Sample output for |
Sample output for all variants: |
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<pre>user> (foo :baz 123) |
<pre>user> (foo :baz 123) |
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