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+---
+title: "recursion"
+date: 2023-06-21T14:00:01+0000
+draft: false
+---
+
+Cairo uses recursion as the principal method of iteration.
+
+Here is how we can calculate the factorial using this method.
+
+```rust {.codebox}
+
+fn main() -> felt252 {
+    factorial(9);
+}
+
+fn factorial(value: felt252) -> felt252 {
+    match value {
+        0 => 1,
+        _ => value * factorial(value-1),
+    }
+}
+```
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