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<!--
slidedeck: A modification of the Google IO 2012 HTML5 slide template
URL: https://github.com/rmcgibbo/slidedeck
Based on https://github.com/francescolaffi/elastic-google-io-slides, and
ultimately:
Google IO 2012 HTML5 Slide Template
Authors: Eric Bidelman <[email protected]>
Luke Mahe <[email protected]>
URL: https://code.google.com/p/io-2012-slides
-->
<!DOCTYPE html>
<html>
<head>
<title> Workshop GO</title>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="chrome=1">
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</head>
<body style="opacity: 0">
<slides class="layout-widescreen">
<slide class="title-slide segue nobackground">
<hgroup class="auto-fadein">
<h1><img height=300 src=figures/golang.png /></h1>
<h2> Workshop GO</h2>
<p> Emile Vauge</p>
</hgroup>
</slide>
<slide >
<hgroup>
<h2>Setup</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>On GitHub, fork <a href="https://github.com/emilevauge/go-lyra">https://github.com/emilevauge/go-lyra</a></li>
<li>Go to <a href="http://c9.io">http://c9.io</a></li>
<li>Sign in using your GitHub account</li>
<li>In Cloud9, edit this repository</li>
<li>Let's code !</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>GO in few words</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>designed by Google (Robert Griesemer, Rob Pike, and Ken Thompson)</li>
<li>open source</li>
<li>commonly called <strong>golang</strong></li>
<li>simple, productive, readable</li>
<li>a modern take on C</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>more words...</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>fast (compile, run)</li>
<li>garbage collected</li>
<li>strongly typed</li>
<li>statically linked binaries</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>Where is the catch?</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>still early (1.0 in March 2012)</li>
<li>dependencies management</li>
<li>no generics (yet)</li>
<li>not really OOP</li>
<li>lack of powerful IDE</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>Here and there</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>Google (obviously)</li>
<li>Docker</li>
<li>Twitter</li>
<li>AirBnB</li>
<li>SoundCloud</li>
<li>Netflix</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>Tools</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li><code>go build</code>: which builds Go binaries</li>
<li><code>go test</code>: for unit testing and microbenchmarks</li>
<li><code>go fmt</code>: for formatting code</li>
<li><code>go run</code>: a shortcut for building and executing code</li>
<li><code>godoc</code>: for displaying documentation or serving it via HTTP</li>
<li><code>go generate</code>: a standard way to invoke code generators</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>Hello, Playground!</h2>
<h3></h3>
</hgroup>
<article ><p><a href="http://play.golang.org/">http://play.golang.org/</a></p>
<pre class="prettyprint" data-lang="go">
package main
import "fmt"
func main() {
fmt.Println("Hello, playground")
}
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Main function</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>Every go program has a main() function</li>
<li>This is where execution starts</li>
</ul>
<pre class="prettyprint" data-lang="go">
package main
func main() {
// Your program starts here
}
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Output</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>fmt is a core package (means “format”)</li>
<li>pronounced "fumpt" (weird)</li>
</ul>
<pre class="prettyprint" data-lang="go">
package main
import "fmt"
func main() {
fmt.Println("Hello Lyra!")
}
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Exercise `1_output`</h2>
<h3></h3>
</hgroup>
<article ></article>
</slide>
<slide >
<hgroup>
<h2>Variables</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>Define</li>
</ul>
<pre class="prettyprint" data-lang="go">
var myVar string
</pre>
<ul>
<li>Initialize</li>
</ul>
<pre class="prettyprint" data-lang="go">
var myVar string
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Type Inference</h2>
<h3></h3>
</hgroup>
<article ><ul>
<li>Define and Initialize</li>
</ul>
<pre class="prettyprint" data-lang="go">
var myVar string
</pre>
<ul>
<li>Initialize</li>
</ul>
<pre class="prettyprint" data-lang="go">
myVar := "Hello"
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Functions</h2>
<h3></h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
func withArgs(a int, b string) int {
return 3
}
result := withArgs(3, "Hello")
</pre>
<pre class="prettyprint" data-lang="go">
func withMultipleReturns() (string, error) {
return "Hello", nil
}
s, err := withMultipleReturns()
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Exercise `4_returns`</h2>
<h3></h3>
</hgroup>
<article ></article>
</slide>
<slide >
<hgroup>
<h2>Structs</h2>
<h3>Define</h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
type Person struct {
Name string
Age int
}
p := Person{
Name: "Greg",
Age: 25,
}
fmt.Println(p.Name)
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Structs</h2>
<h3>Access</h3>
</hgroup>
<article ><ul>
<li>public Properties Are Uppercase</li>
</ul>
<p><em>accessible to anything</em></p>
<ul>
<li>private properties are lowercase</li>
</ul>
<p><em>only accessible via methods</em></p></article>
</slide>
<slide >
<hgroup>
<h2>Structs</h2>
<h3>Instantiation</h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
type Person struct {
Name string
Age int
}
p := Person{
Name: "Greg",
Age: 25,
}
fmt.Println(p.Name)
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Structs</h2>
<h3>Methods</h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
type Person struct {
Name string
Age int
}
func (p *Person) CanEnterPub() bool {
return p.Age >= 19
}
person.CanEnterPub()
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Exercise `6_methods`</h2>
<h3></h3>
</hgroup>
<article ></article>
</slide>
<slide >
<hgroup>
<h2>GoRoutines</h2>
<h3></h3>
</hgroup>
<article ><p>Goroutines are lightweight threads of execution</p>
<ul>
<li>executed concurrently</li>
<li>supports > 100,000 goroutines</li>
<li>automatically distributes load across CPUs</li>
<li>Worry free!</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>GoRoutines</h2>
<h3>How?</h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
doSomething()
</pre>
<pre class="prettyprint" data-lang="go">
go doSomething()
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Channels</h2>
<h3></h3>
</hgroup>
<article ><p>Goroutines communicate via channels: one-way pipes
Operations:</p>
<ul>
<li>Push to channel</li>
<li>Listen to channel</li>
</ul>
<p>Channels have types too:</p>
<ul>
<li>var chan int</li>
<li>var chan string</li>
<li>var chan map[string]MyStruct</li>
</ul>
<p>Use channels to share state, for control flow</p></article>
</slide>
<slide >
<hgroup>
<h2>Channels</h2>
<h3>Pushing</h3>
</hgroup>
<article ><ul>
<li>
<p>Use <code>make()</code> to create a channel
<pre class="prettyprint" data-lang="go">
var channel := make(chan int)
</pre></p>
</li>
<li>
<p>Push to a channel with <code><-</code>
<pre class="prettyprint" data-lang="go">
channel <- 5
channel <- 3
</pre></p>
</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>Channels</h2>
<h3>Listening</h3>
</hgroup>
<article ><ul>
<li>Use select to wait (block) for a single message</li>
<li>
<p>Similar syntax to case
<pre class="prettyprint" data-lang="go">
select {
case i <- channel:
fmt.Printf("Got message %d", i)
}
</pre></p>
</li>
<li>
<p>Watch for multiple messages using range
<pre class="prettyprint" data-lang="go">
for i := range channel {
fmt.Printf("Got message %d", i)
}
</pre></p>
</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>Exercise `9_channels`</h2>
<h3></h3>
</hgroup>
<article ></article>
</slide>
<slide >
<hgroup>
<h2>Loops</h2>
<h3></h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
// for loop
for i := 0; i < 10; i++ {...}
// while loop
for i < 10 {...}
// infinite loop
for {...}
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Web</h2>
<h3></h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
package main
import (
"fmt"
"net/http"
)
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
}
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Exercise `12_web`</h2>
<h3></h3>
</hgroup>
<article ></article>
</slide>
<slide >
<hgroup>
<h2>Gorilla</h2>
<h3>Advanced routing</h3>
</hgroup>
<article ><ul>
<li>URL host</li>
<li>path</li>
<li>path prefix</li>
<li>schemes</li>
<li>header</li>
<li>query values</li>
<li>HTTP methods</li>
<li>custom matchers</li>
</ul></article>
</slide>
<slide >
<hgroup>
<h2>Gorilla</h2>
<h3>Example</h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
func main() {
r := mux.NewRouter()
r.HandleFunc("/", HomeHandler)
r.HandleFunc("/products", ProductsHandler)
r.HandleFunc("/articles", ArticlesHandler)
http.ListenAndServe(":8080", r)
}
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Gorilla</h2>
<h3>Variables</h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
r := mux.NewRouter()
r.HandleFunc("/products/{key}", ProductHandler)
r.HandleFunc("/articles/{category}/", ArticlesCategoryHandler)
r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler)
</pre>
<pre class="prettyprint" data-lang="go">
vars := mux.Vars(request)
category := vars["category"]
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Gorilla</h2>
<h3>Domain, Dynamic sub-domain</h3>
</hgroup>
<article ><pre class="prettyprint" data-lang="go">
r := mux.NewRouter()
// Only matches if domain is "www.example.com".
r.Host("www.example.com")
// Matches a dynamic subdomain.
r.Host("{subdomain:[a-z]+}.domain.com")
</pre></article>
</slide>
<slide >
<hgroup>
<h2>Exercise `13_rest`</h2>
<h3></h3>
</hgroup>
<article ></article>
</slide>
<slide class="thank-you-slide segue nobackground">
<!-- <aside class="gdbar right"><img src="images/google_developers_icon_128.png"></aside> -->
<article class="flexbox vleft auto-fadein">
<h2> Thank you!</h2>
<p></p>
</article>
<p data-config-contact class="auto-fadein"> <a href="https://twitter.com/emilevauge">@emilevauge</a></p>
</p>
</slide>
<slide class="backdrop"></slide>
</slides>
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