Arguments: (test-form {then then-form+ | thenret} {elseif else-test-form {then else-then-form+ | thenret}}* [else else-form+])
This form consists of a series of clauses introduced by the symbols
then, elseif,
else, and thenret.
First the predicate test-form is
evaluated.
If it is true,
the then-forms are evaluated, and the
value of the last such form is returned.
If test-form evaluates to nil,
any remaining clauses are processed.
If no clauses remain, if*
returns nil.
When a thenret clause is
encountered no further evaluation takes place,
and the value of the most recently evaluated
test-form is returned.
When an elseif clause is encountered,
the predicate else-test-form
is evaluated. If it is true,
the else-then-forms are evaluated,
and the value of the last such form is returned;
otherwise any remaining clauses are
processed. If no clauses remain, if*
returns nil. And lastly,
when an else clause is encountered, the
else-forms are evaluated,
and the value of the last such form is returned.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.