Video 93: Promise Chaining

playground/8-promises.js

@@ -1,12 +1,28 @@
-const doWorkPromise = new Promise((resolve, reject) => {
-  setTimeout(() => {
-    reject('Things went wrong!')
-    // resolve([7, 4, 1])
-  }, 2000)
-})
+const add = (a, b) => {
+  return new Promise((resolve, reject) => {
+    setTimeout(() => {
+      resolve(a + b)
+    }, 2000)
+  })
+}
 
-doWorkPromise.then((result) => {
-  console.log('Success!', result)
-}).catch((error) => {
-  console.log('Error!', error)
+// add(1, 2).then((sum) => {
+//   console.log(sum)
+//
+//   add(sum, 5).then((sum2) => {
+//     console.log(sum2)
+//   }).catch((e) => {
+//     console.log(e)
+//   })
+// }).catch((e) => {
+//   console.log(e)
+// })
+
+add(1, 1).then((sum) => {
+  console.log(sum)
+  return add(sum, 4)
+}).then((sum2) => {
+  console.log(sum2)
+}).catch((e) => {
+  console.log(e)
 })