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(if <boolean> then <expression>+ [else <expression>+])

(if <boolean> then <expression>+ [else <expression>+])

Allows conditional execution of a group of actions. The Boolean expression is evaluated. If it does not evaluate to FALSE, the first list of expressions is evaluated, and the return value is whatever is returned by the last expression of that list. If the Boolean expression evaluates to FALSE and the optional second list of expressions is supplied, then those expressions are evaluated, and the value of the last is returned.


  

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