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Algo/Séminaire/Chapter 3 - Case analysis.md

@@ -49,3 +49,28 @@ Exception: Invalid_argument "oops"
 	else a/b ;;;
 val div int -> int -> int = <fun>
 ```
+
+## 3.3. Filtering
+### Explicit filtering
+
+> Explicit means that you matches the value
+
+
+**General syntax**
+
+```Ocaml
+match expr with pattern1 -> result1 | pattern2 -> result2 | ... | patternn -> resultn 
+```
+> All expressions and pattern must avec the same type
+
+**Example**
+```Ocaml
+# let f x = match x with 
+	0 -> 18
+	1 -> 24
+	y ->  y + y;;
+
+val f : int -> int = <fun>
+
+# f 1;;
+- : int = 24