Conditionals · Husk 3.2

(if {test} {consequent} {alternate} ) syntax

(if {test} {consequent} ) syntax

Syntax: Test, consequent, and alternate are expressions.

Semantics: An if expression is evaluated as follows: first, test is evaluated. If it yields a true value (see section 6.3), then consequent is evaluated and its values are returned. Otherwise alternate is evaluated and its values are returned. If test yields a false value and no alternate is specified, then the result of the expression is unspecified.

(if (> 3 2) 'yes 'no)   ==> yes
(if (> 2 3) 'yes 'no)   ==> no
(if (> 3 2)
    (- 3 2)
    (+ 3 2))            ==> 1