Special Forms and Syntax Sugars in Clojure
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(...): function literals, p40, 64;
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'(...): suppress evaluation, p24;
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_(...): comments, p18;
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"...": regular expression, p17;
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(def x y): bind x to y;
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(fn [parameters] (function-body)): define a function;
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(defn func-name [parameters] (body)): define a function and bind it to "func-name";
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(let [s1 v1 s2 v2 ...] (body))