Intercept unhandled and handled situations

tshemsedinov · tshemsedinov · commit 55adc5ba2a08 · 2019-03-07T14:19:42.000+02:00
diff --git a/JavaScript/5-warning.js b/JavaScript/5-warning.js
@@ -0,0 +1,18 @@
+'use strict';
+
+const sum = (a, b) => new Promise((resolve, reject) => {
+  if (typeof a === 'number' && typeof b === 'number') {
+    resolve(a + b);
+  } else {
+    reject(new Error('a and b should be numbers'));
+  }
+});
+
+process.on('warning', warning => {
+  console.log({ warning });
+});
+
+sum(7, 'A')
+  .then(data => {
+    console.log(data);
+  });
diff --git a/JavaScript/6-intercepted.js b/JavaScript/6-intercepted.js
@@ -0,0 +1,18 @@
+'use strict';
+
+const sum = (a, b) => new Promise((resolve, reject) => {
+  if (typeof a === 'number' && typeof b === 'number') {
+    resolve(a + b);
+  } else {
+    reject(new Error('a and b should be numbers'));
+  }
+});
+
+process.on('unhandledRejection', (reason, promise) => {
+  console.log({ unhandledRejection: { reason, promise } });
+});
+
+sum(7, 'A')
+  .then(data => {
+    console.log({ data });
+  });
diff --git a/JavaScript/7-handled.js b/JavaScript/7-handled.js
@@ -0,0 +1,32 @@
+'use strict';
+
+const sum = (a, b) => new Promise((resolve, reject) => {
+  if (typeof a === 'number' && typeof b === 'number') {
+    resolve(a + b);
+  } else {
+    reject(new Error('a and b should be numbers'));
+  }
+});
+
+process.on('unhandledRejection', (reason, promise) => {
+  console.log({ unhandledRejection: { reason, promise } });
+});
+
+process.on('rejectionHandled', promise => {
+  console.log({ rejectionHandled: { promise } });
+});
+
+const p1 = sum(7, 'A')
+  .then(data => {
+    console.log(data);
+  });
+
+//p1.catch(err => {
+//  console.log({ catch1: err });
+//});
+
+setTimeout(() => {
+  p1.catch(err => {
+    console.log({ catch2: err });
+  });
+}, 0);
