IF statement

The if statement in Clojure has the forms:

(if test thencode )

(if test thencode elsecode )

The test is interpreted as follows:

• false or nil are considered to be false.

• anything else is considered to be true, including ().

The if statement returns the value of either the thencode or elsecode; cf. the C form test ? thenval : elseval

(if true 2 3)       ->  2

(if false 2 3)      ->  3

(if '() 2 3)        ->  2

(if (+ 2 3) 2 3)    ->  2