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154/async.js

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+// node.js style callbacks
+function1(args, (err, data) => {
+    function2(args, (err, data) => {
+        function3(args, (err, data) => {
+
+        });
+    });
+});
+
+// promise style callbacks
+function1(args)
+    .then(data => {
+        return function2(args);
+    })
+    .then(data => {
+        return function3(args);
+    })
+    .catch(err => {
+        console.log(err);
+    });
+
+// async/await style
+try {
+    let data1 = await function1(args);
+    let data2 = await function2(args);
+    let data3 = await function3(args);
+
+    function4().then(data => {
+        console.log('done');
+    });
+} catch (e) {
+    console.log(e);
+}

154/notes.yml

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+tips:
+    - stay up-to-date on the latest version of node.js
+    - make use of well supported npm modules
+    - use a bundler for frontend things
+    - use async/await, normal promises to defer
+    - use strict equality === exclusively
+    - don't block the event loop
+    - avoid clever one-liners

154/oneline.js

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+// normal
+switch (a) {
+    case 1:
+        console.log('one');
+        break;
+    case 2:
+        console.log('two');
+        break;
+    default:
+        console.log('none');
+}
+
+// one liner
+console.log(a === 1 ? 'one' : a === 2 ? 'two' : 'none');