Recursion

<p>We can now create recursive functions like factorial. Recursive functions have to be defined inside a <b>letrec</b> so that they can reference themselves. This is a recursive version of factorial</p>
<p>
<ul>
<li><a class="example">[letrec '[
    factorial:[lambda '[n:1]
        '[if [= n 1]
            then:1
            else:[* n [factorial [- n 1]]]
        ]
    ]]
    '[factorial 25]
]</a>
</ul>
</p>