diff --git a/.gitignore b/.gitignore
index c6bba59..d861ebc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -128,3 +128,5 @@ dist
 .yarn/build-state.yml
 .yarn/install-state.gz
 .pnp.*
+.idea
+.vscode
diff --git a/src/bonjour_au_revoir.ts b/src/bonjour_au_revoir.ts
new file mode 100644
index 0000000..b97de3f
--- /dev/null
+++ b/src/bonjour_au_revoir.ts
@@ -0,0 +1,39 @@
+import { delay } from "https://deno.land/std@0.202.0/async/delay.ts";
+
+async function asyncSayHiAndBye(name: string): Promise<void>{
+    await delay(1000);
+    console.log("bonjour")
+    await delay(1000);
+    console.log("au revoir " + name);
+}
+
+
+function promiseSayHiAndBye(name: string): Promise<void>{
+    return delay(1000)
+        .then(function(){console.log("bonjour")})
+        .then(function(){delay(1000)})
+        .then(function(){console.log("au revoir " + name)});
+}
+
+function promiseWithFatArrowsSayHiAndBye(name: string): Promise<void>{
+    return delay(1000)
+        .then(() => console.log("bonjour"))
+        .then(() => delay(1000))
+        .then(() => console.log("au revoir " + name));
+}
+
+
+
+function callbackSayHiAndBye(name: string): void{
+    setTimeout(function(){
+        console.log("Bonjour");
+        setTimeout(function(){
+            console.log("au revoir " + name)
+        }, 1000);
+    }, 1000);
+}
+
+await asyncSayHiAndBye("didier");
+await promiseSayHiAndBye("walid");
+await promiseWithFatArrowsSayHiAndBye("Haikel")
+callbackSayHiAndBye("jonathan")
\ No newline at end of file