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Node.js beyond the basics quiz

Test your knowledge path progress

Andrew Glover, CTO, App47

Andrew Glover is a developer, author, speaker, and entrepreneur with a passion for behavior-driven development, Continuous Integration, and Agile software development. He is the founder of the easyb Behavior-Driven Development (BDD) framework and is the co-author of three books: Continuous Integration, Groovy in Action, and Java Testing Patterns. You can keep up with him at his blog and by following him on Twitter.

Summary: Test your Node.js knowledge and skills and you'll be able to quickly assess how well you've mastered key information and coding techniques you've learned from this knowledge path.

Date: 26 Jun 2012
Level: Intermediate
PDF: A4 and Letter (144 KB | 5 pages)Get Adobe® Reader®
Also available in: Chinese Japanese Portuguese

Activity: 16286 views
Comments:

These exercises and solutions supplement the developerWorks knowledge path "Node.js beyond the basics."

Convert this simple node web application into Coffeescript:

var express = require('express');

var app = express.createServer(express.logger());

app.get('/', function(req, res) {
  res.send("Hello World!");
});

var port = process.env.PORT || 3000;

app.listen(port, function() {
  console.log("listening on " + port);
});

You inherited some code, written in Coffeescript, but it doesn't compile. Fix it:

express = require 'express'

app = express.createServer(express.logger());

app.get '/', (req, res) ->
	console.log "/ hit!"
		res.send "Hello World!"

var port = process.env.PORT || 3000

app.listen port, ->
	  console.log "listening on #{port}"

Amazon's DynamoDB only supports string data types:

True
False

DynamoDB supports indexing many different keys in a table:

True
False

Why won't this Node program run? What's wrong with it?

var express = require('express');

var app = express.createServer(express.logger());

app.get('/', function(req, res) {
  res.send("Hello World!");
});

var port = process.env.PORT || 3000;

app.listen(port, function() {
  console.log("listening on #{port}");
});

Cake is:

CoffeeScript's build tool
Node library for working with DynamoDB
Language inspired by Fortran that makes working with JavaScript easier

Deploying your code to Heroku is done via:

SCP
FTP
Git push
Custom protocol

DynamoDB's Scan API allows you to:

Search on non-primary key fields
Bulk upload images
Create new Attributes in an Item

With the Mocha testing framework, you can test both synchronous and asynchronous code:

True
False

You can speed up a web app hosted on Heroku by adding more Dynos:

True
False

What's wrong with the logic in this Mocha test written in CoffeeScript? Why does this test fail?

describe 'updates for a beer using DynamoDB API', ->
	before (done) ->
		update = {votes: {put : 1}, type: {put: 'IPA'}}
		dynode.updateItem 'beer_ratings', '60 Minute IPA', update, (err, resp) ->
			done(err)
	it 'should support incrementing a value corresponding to a vote', (done) ->
		dynode.getItem 'beer_ratings', '60 Minute IPA', (err, item, meta) ->
			item.should.have.property 'votes'
			item.votes.should.be.above 1
			done(err)
	after ->
		update = {votes: {add : 1}, type : {put: 'IPA'}}
		dynode.updateItem 'beer_ratings', '60 Minute IPA', update, (err, resp) ->

Answers

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Resources

Node.js beyond the basics: This knowledge path starts with Node.js basics and takes you beyond them to using Node and supporting technologies to build an application, test it, and deploy it on a platform-as-a service.
developerWorks Java technology zone: Find hundreds of articles about every aspect of Java programming.

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