add promises demos #51

stuff/js/es6/promises.js

@@ -0,0 +1,36 @@
+new Promise((resolve, reject) => {
+    // setTimeout(() =>  resolve(123), 1000)
+    setTimeout(() => reject(123), 1000)
+})
+    //.then(value => console.log(value), error => console.error(error))
+    .then(value => console.log(value))
+    //.catch(error => console.error(error))
+    .then(() => {
+        return new Promise((resolve, reject) => {
+            setTimeout(() => resolve(456), 1000)
+        })
+    })
+    .then(value => console.log(value))
+    .catch(error => {
+        console.error(error)
+
+        //return 789
+        throw new Error('012')
+    })
+    //.then(value => console.log(value), error => console.error(error))
+    .then(value => console.log(value))
+    .catch(error => console.error(error))
+
+// console.log(345)
+// VM1281: 24 345
+// undefined
+// 563 - 10c5b65a2ff77937.js: 1 123
+// window.console.error @563-10c5b65a2ff77937.js: 1
+// overrideMethod @console.js: 288
+//     (anonymous) @VM1281: 15
+// Promise.catch
+//     (anonymous) @VM1281: 14
+// Show 1 more frame
+// Show less
+// 563 - 10c5b65a2ff77937.js: 1 Error: 012
+// at < anonymous >: 18: 15