add promises demos #51

stuff/js/es6/promises.js

@@ -0,0 +1,51 @@
+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))
+    .then(() => {
+        console.log(678)
+
+        throw new Error('901')
+    })
+
+// console.log(345)
+// VM1316:29 345
+// undefined
+// 563-10c5b65a2ff77937.js:1 123
+// window.console.error @ 563-10c5b65a2ff77937.js:1
+// overrideMethod @ console.js:288
+// (anonymous) @ VM1316:15
+// Promise.catch
+// (anonymous) @ VM1316:14
+// Show 1 more frame
+// Show less
+// 563-10c5b65a2ff77937.js:1 Error: 012
+//     at <anonymous>:18:15
+// window.console.error @ 563-10c5b65a2ff77937.js:1
+// overrideMethod @ console.js:288
+// (anonymous) @ VM1316:22
+// Promise.catch
+// (anonymous) @ VM1316:22
+// Show 1 more frame
+// Show less
+// VM1316:24 678
+// VM1316:26 Uncaught (in promise) Error: 901
+//     at <anonymous>:26:15