Async js with promises

Author: shama

async-js-with-promises/README.md

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+# Async JavaScript with Promises
+
+> [https://youtu.be/g90irqWEqd8](https://youtu.be/g90irqWEqd8)
+
+Install [io.js](https://iojs.org/en/index.html).
+
+Within this folder run the terminal command `npm install` to install the
+`devDependencies` and `dependencies`.
+
+Then run `npm start` to start up a development server on `http://localhost:9966`

async-js-with-promises/bears.txt

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+grizzly
+polar
+brown

async-js-with-promises/fetch.js

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+var xhr = require('xhr')
+
+module.exports = function (uri) {
+  return new Promise(function (resolve, reject) {
+    xhr(uri, function (err, res, body) {
+      if (err) return reject(err)
+      if (res.statusCode !== 200) return reject(new Error(body))
+      resolve(body)
+    })
+  })
+}

async-js-with-promises/fish.txt

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+salmon
+tuna
+bass

async-js-with-promises/index.js

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+var fetch = require('./fetch.js')
+
+// Using then and catch
+// var promise = fetch('bears.txt')
+//
+// promise.then(function (bears) {
+//   console.log(bears)
+//   //throw new Error('Uh oh')
+//   return fetch('fish.txt')
+// }).then(function (fish) {
+//   console.log(fish)
+// }).catch(function (err) {
+//   console.error('WE GOT ERROR', err)
+// })
+
+// Using Promise.all
+// Promise.all([
+//   fetch('bears.txt'),
+//   fetch('fish.txt'),
+// ]).then(function (values) {
+//   var bears = values[0]
+//   var fish = values[1]
+//   console.log(bears, fish)
+// })
+
+// Creating promises
+var promise = new Promise(function (resolve, reject) {
+  //reject(new Error("uh oh"))
+  resolve('all good')
+})
+
+promise.then(function (result) {
+  console.log('was it good?', result)
+}).catch(function (err) {
+  console.error('ERR', err)
+})

async-js-with-promises/package.json

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+{
+  "name": "async-js-with-promises",
+  "version": "0.1.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "budo index.js --live"
+  },
+  "author": "Kyle Robinson Young <[email protected]> (http://dontkry.com)",
+  "license": "MIT",
+  "devDependencies": {
+    "budo": "^4.0.0"
+  },
+  "dependencies": {
+    "xhr": "^2.0.2"
+  }
+}