diff --git a/exo4.ts b/exo4.ts
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..9c970c349d4848f42809c74e70f46fbd549775d4 100644
--- a/exo4.ts
+++ b/exo4.ts
@@ -0,0 +1,10 @@
+function deb3(xy: number[]): void {
+    xy[0] = 100;
+    xy[1] = 200;
+
+    console.log(xy);
+}
+
+let xy = [10, 20];
+deb3(xy);
+console.log(xy);
\ No newline at end of file