diff --git a/beli.js b/beli.js
index 060efcd..602ca56 100644
--- a/beli.js
+++ b/beli.js
@@ -1,15 +1,22 @@
-function beli(uang, obj, cb){
+function beli(uang, obj){
   console.log(`Saya pergi membeli ${obj.item}`)
-  setTimeout(function(){
-    let kembalian = uang - obj.harga
-    if (kembalian > 0) {
-      console.log(`Saya sudah membeli ${obj.item} uang kembaliannya ${kembalian}`);
-      cb(kembalian)
-    }else{
-      console.log(`uang gk cukup nih buat beli ${obj.item} kembaliannya cuma ${kembalian}`);
-      cb(0)
-    }
-  }, obj.waktu);
+  return new Promise((resolve,reject)=> {
+    setTimeout(function(){
+      let kembalian = uang - obj.harga
+      if (kembalian > 0) {
+        console.log(`Saya sudah membeli ${obj.item} uang kembaliannya ${kembalian}`);
+        resolve(kembalian)
+      }else{
+        console.log(`uang gk cukup nih buat beli ${obj.item}. Sisa uang ${uang}`);
+        reject(0)
+      }
+    }, obj.waktu);
+
+  })
+ 
 }
 
+
+
+
 module.exports = beli;
diff --git a/index.js b/index.js
index e69de29..6f43676 100644
--- a/index.js
+++ b/index.js
@@ -0,0 +1,40 @@
+// const fs = require('fs');
+const beli = require('./beli.js');
+
+var obj1 = {};
+obj1.item = 'bubur';
+obj1.harga = 1000;
+obj1.waktu = 2000;
+
+var obj2 = {};
+obj2.item = 'ayam';
+obj2.harga = 2000;
+obj2.waktu = 2000;
+
+var obj3 = {};
+obj3.item = 'sayur';
+obj3.harga = 4000;
+obj3.waktu = 2000;
+
+var obj4 = {};
+obj4.item = 'nasi';
+obj4.harga = 5000;
+obj4.waktu = 2000;
+
+var obj5 = {};
+obj5.item = 'sate';
+obj5.harga = 7000;
+obj5.waktu = 2000;
+
+beli(2000,obj1).then(success => {console.log(success);
+    beli(success,obj2).then(success => {console.log(success);
+        beli(success,obj3).then(success => {console.log(success);
+            beli(success,obj4).then(success => {console.log(success);
+                beli(success,obj5).then(success => {console.log(success);
+    
+                }).catch(error => {console.log(error);});
+            }).catch(error => {console.log(error);});
+        }).catch(error => {console.log(error);});
+    }).catch(error => {console.log(error);});
+}).catch(error => {console.log(error);});
+
diff --git a/testPromis.js b/testPromis.js
new file mode 100644
index 0000000..cb527b8
--- /dev/null
+++ b/testPromis.js
@@ -0,0 +1,34 @@
+// function Sandwich(stock) {
+//     return new Promise ((resolve,reject) => {
+//         if (stock >= 1) {
+//             resolve ('Ini mas cheese burgernya !')
+//         } else {
+//             reject ('Maaf mas burgernya habis !')
+//         }
+//     })
+
+// }
+
+// Sandwich(0).then(success => {
+//             console.log(success)
+//         }).catch(error => {
+//             console.log(error);
+//         })
+
+
+// class Burger {
+//         constructor() {
+//         }
+//         static getOrder(stock) {
+//             return new Promise ((resolve,reject) => {
+//                 if (stock >= 1) {resolve ('Ini mas cheese burgernya !')}
+//                 else {reject ('Maaf mas burgernya habis !')}
+//             })
+//         }
+//     }
+
+// Burger.getOrder(3).then(success => {
+//         console.log(success)
+//     }).catch(error => {
+//         console.log(error);
+//     })
\ No newline at end of file