_content/talks: add talks.golang.org content
Copied from golang.org/x/talks/content at a07c284b (Feb 8 2021)
and from golang.org/x/tools/cmd/present/static and templates
at 43b469a3 (Nov 17 2021).
Adds 80MB (uncompressed) to the repository and the
cmd/golangorg binary.
Change-Id: I4949e41bf6f3ccc28ea13303d79ed6931abe86e7
Reviewed-on: https://go-review.googlesource.com/c/website/+/365135
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
diff --git a/_content/talks/2012/goforc/adder.go b/_content/talks/2012/goforc/adder.go
new file mode 100644
index 0000000..1ebc71a
--- /dev/null
+++ b/_content/talks/2012/goforc/adder.go
@@ -0,0 +1,23 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+
+// START1 OMIT
+func adder(delta int) func(x int) int {
+ f := func(x int) int { // HL
+ return x + delta // HL
+ } // HL
+ return f
+}
+
+// STOP1 OMIT
+
+func main() {
+ // START2 OMIT
+ var inc = adder(1)
+ fmt.Println(inc(0))
+ fmt.Println(adder(-1)(10))
+ // STOP2 OMIT
+}
diff --git a/_content/talks/2012/goforc/cat.go b/_content/talks/2012/goforc/cat.go
new file mode 100644
index 0000000..3979df1
--- /dev/null
+++ b/_content/talks/2012/goforc/cat.go
@@ -0,0 +1,24 @@
+// +build ignore,OMIT
+
+package main
+
+import (
+ "flag"
+ "io"
+ "os"
+)
+
+func main() {
+ flag.Parse()
+ for _, arg := range flag.Args() {
+ f, err := os.Open(arg)
+ if err != nil {
+ panic(err)
+ }
+ defer f.Close()
+ _, err = io.Copy(os.Stdout, f) // HL
+ if err != nil {
+ panic(err)
+ }
+ }
+}
diff --git a/_content/talks/2012/goforc/celsius.go b/_content/talks/2012/goforc/celsius.go
new file mode 100644
index 0000000..ffb4572
--- /dev/null
+++ b/_content/talks/2012/goforc/celsius.go
@@ -0,0 +1,19 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+
+type Celsius float32
+type Fahrenheit float32
+
+func (t Celsius) String() string { return fmt.Sprintf("%g°C", t) }
+func (t Fahrenheit) String() string { return fmt.Sprintf("%g°F", t) }
+func (t Celsius) ToFahrenheit() Fahrenheit { return Fahrenheit(t*9/5 + 32) }
+
+func main() {
+ var t Celsius = 21
+ fmt.Println(t.String())
+ fmt.Println(t)
+ fmt.Println(t.ToFahrenheit())
+}
diff --git a/_content/talks/2012/goforc/channels.go b/_content/talks/2012/goforc/channels.go
new file mode 100644
index 0000000..a10c9cb
--- /dev/null
+++ b/_content/talks/2012/goforc/channels.go
@@ -0,0 +1,28 @@
+// +build ignore,OMIT
+
+package main
+
+func main() {
+ var value int
+
+ // START1 OMIT
+ // Declaring and initializing.
+ var c chan int
+ c = make(chan int)
+ // or
+ c := make(chan int) // HL
+ // STOP1 OMIT
+
+ // START2 OMIT
+ // Sending on a channel.
+ c <- 1 // HL
+ // STOP2 OMIT
+
+ // START3 OMIT
+ // Receiving from a channel.
+ // The "arrow" indicates the direction of data flow.
+ value = <-c // HL
+ // STOP3 OMIT
+
+ _ = value
+}
diff --git a/_content/talks/2012/goforc/communication1.go b/_content/talks/2012/goforc/communication1.go
new file mode 100644
index 0000000..4825227
--- /dev/null
+++ b/_content/talks/2012/goforc/communication1.go
@@ -0,0 +1,30 @@
+// +build ignore,OMIT
+
+package main
+
+import (
+ "fmt"
+ "time"
+)
+
+// START1 OMIT
+func main() {
+ c := make(chan string)
+ go f("three", 300*time.Millisecond, c)
+ for i := 0; i < 10; i++ {
+ fmt.Println("Received", <-c) // Receive expression is just a value. // HL
+ }
+ fmt.Println("Done.")
+}
+
+// STOP1 OMIT
+
+// START2 OMIT
+func f(msg string, delay time.Duration, c chan string) {
+ for i := 0; ; i++ {
+ c <- fmt.Sprintf("%s %d", msg, i) // Any suitable value can be sent. // HL
+ time.Sleep(delay)
+ }
+}
+
+// STOP2 OMIT
diff --git a/_content/talks/2012/goforc/communication2.go b/_content/talks/2012/goforc/communication2.go
new file mode 100644
index 0000000..20c815b
--- /dev/null
+++ b/_content/talks/2012/goforc/communication2.go
@@ -0,0 +1,32 @@
+// +build ignore,OMIT
+
+package main
+
+import (
+ "fmt"
+ "time"
+)
+
+// START1 OMIT
+func main() {
+ c := make(chan string)
+ go f("three", 300*time.Millisecond, c) // HL
+ go f("six", 600*time.Millisecond, c) // HL
+ go f("nine", 900*time.Millisecond, c) // HL
+ for i := 0; i < 10; i++ {
+ fmt.Println("Received", <-c)
+ }
+ fmt.Println("Done.")
+}
+
+// STOP1 OMIT
+
+// START2 OMIT
+func f(msg string, delay time.Duration, c chan string) {
+ for i := 0; ; i++ {
+ c <- fmt.Sprintf("%s %d", msg, i) // Any suitable value can be sent. // HL
+ time.Sleep(delay)
+ }
+}
+
+// STOP2 OMIT
diff --git a/_content/talks/2012/goforc/consts.go b/_content/talks/2012/goforc/consts.go
new file mode 100644
index 0000000..33cf221
--- /dev/null
+++ b/_content/talks/2012/goforc/consts.go
@@ -0,0 +1,26 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+
+// START1 OMIT
+const (
+ MaxUInt = 1<<64 - 1
+ Pi = 3.14159265358979323846264338327950288419716939937510582097494459
+ Pi2 = Pi * Pi
+ Delta = 2.0
+)
+
+// STOP1 OMIT
+
+func main() {
+ // START2 OMIT
+ var x uint64 = MaxUInt
+ var pi2 float32 = Pi2
+ var delta int = Delta
+ // STOP2 OMIT
+ fmt.Println("x =", x)
+ fmt.Println("pi2 =", pi2)
+ fmt.Println("delta =", delta)
+}
diff --git a/_content/talks/2012/goforc/decls.go b/_content/talks/2012/goforc/decls.go
new file mode 100644
index 0000000..b49dd4f
--- /dev/null
+++ b/_content/talks/2012/goforc/decls.go
@@ -0,0 +1,25 @@
+// +build ignore,OMIT
+
+package main
+
+// START OMIT
+import "fmt"
+
+const digits = "0123456789abcdef"
+
+type Point struct {
+ x, y int
+ tag string
+}
+
+var s [32]byte
+
+var msgs = []string{"Hello, 世界", "Ciao, Mondo"}
+
+func itoa(x, base int) string
+
+// STOP OMIT
+
+func main() {
+ fmt.Println() // use fmt
+}
diff --git a/_content/talks/2012/goforc/example0.go b/_content/talks/2012/goforc/example0.go
new file mode 100644
index 0000000..fa1d0f7
--- /dev/null
+++ b/_content/talks/2012/goforc/example0.go
@@ -0,0 +1,25 @@
+// +build ignore,OMIT
+
+package main
+
+import (
+ "fmt"
+ "time"
+)
+
+// START1 OMIT
+func main() {
+ f("Hello, World", 500*time.Millisecond)
+}
+
+// STOP1 OMIT
+
+// START2 OMIT
+func f(msg string, delay time.Duration) {
+ for i := 0; ; i++ {
+ fmt.Println(msg, i)
+ time.Sleep(delay)
+ }
+}
+
+// STOP2 OMIT
diff --git a/_content/talks/2012/goforc/example1.go b/_content/talks/2012/goforc/example1.go
new file mode 100644
index 0000000..ced6d0e
--- /dev/null
+++ b/_content/talks/2012/goforc/example1.go
@@ -0,0 +1,24 @@
+// +build ignore,OMIT
+
+package main
+
+import (
+ "fmt"
+ "time"
+)
+
+// START OMIT
+func main() {
+ go f("three", 300*time.Millisecond)
+ go f("six", 600*time.Millisecond)
+ go f("nine", 900*time.Millisecond)
+}
+
+// STOP OMIT
+
+func f(msg string, delay time.Duration) {
+ for i := 0; ; i++ {
+ fmt.Println(msg, i)
+ time.Sleep(delay)
+ }
+}
diff --git a/_content/talks/2012/goforc/example2.go b/_content/talks/2012/goforc/example2.go
new file mode 100644
index 0000000..3b8504f
--- /dev/null
+++ b/_content/talks/2012/goforc/example2.go
@@ -0,0 +1,26 @@
+// +build ignore,OMIT
+
+package main
+
+import (
+ "fmt"
+ "time"
+)
+
+// START OMIT
+func main() {
+ go f("three", 300*time.Millisecond)
+ go f("six", 600*time.Millisecond)
+ go f("nine", 900*time.Millisecond)
+ time.Sleep(3 * time.Second)
+ fmt.Println("Done.")
+}
+
+// STOP OMIT
+
+func f(msg string, delay time.Duration) {
+ for i := 0; ; i++ {
+ fmt.Println(msg, i)
+ time.Sleep(delay)
+ }
+}
diff --git a/_content/talks/2012/goforc/forloop.go b/_content/talks/2012/goforc/forloop.go
new file mode 100644
index 0000000..12975c4
--- /dev/null
+++ b/_content/talks/2012/goforc/forloop.go
@@ -0,0 +1,30 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+
+var primes = [...]int{2, 3, 5, 7, 11, 13, 17, 19}
+
+func _() {
+ // START1 OMIT
+ for i := 0; i < len(primes); i++ {
+ fmt.Println(i, primes[i])
+ }
+ // STOP1 OMIT
+
+ // START2 OMIT
+ var sum int
+ for _, x := range primes {
+ sum += x
+ }
+ // STOP2 OMIT
+}
+
+func main() {
+ // START3 OMIT
+ for i, x := range primes {
+ fmt.Println(i, x)
+ }
+ // STOP3 OMIT
+}
diff --git a/_content/talks/2012/goforc/hello.go b/_content/talks/2012/goforc/hello.go
new file mode 100644
index 0000000..e4f48ab
--- /dev/null
+++ b/_content/talks/2012/goforc/hello.go
@@ -0,0 +1,9 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+
+func main() {
+ fmt.Println("Hello, 世界")
+}
diff --git a/_content/talks/2012/goforc/interface.go b/_content/talks/2012/goforc/interface.go
new file mode 100644
index 0000000..02bc0f6
--- /dev/null
+++ b/_content/talks/2012/goforc/interface.go
@@ -0,0 +1,36 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+
+type Point struct{ x, y int }
+
+func (p Point) String() string { return fmt.Sprintf("Point{%d, %d}", p.x, p.y) }
+
+type Celsius float32
+type Fahrenheit float32
+
+func (t Celsius) String() string { return fmt.Sprintf("%g°C", t) }
+func (t Fahrenheit) String() string { return fmt.Sprintf("%g°F", t) }
+func (t Celsius) ToFahrenheit() Fahrenheit { return Fahrenheit(t*9/5 + 32) }
+
+func main() {
+ // START OMIT
+ type Stringer interface {
+ String() string
+ }
+
+ var v Stringer // HL
+ var corner = Point{1, 1}
+ var boiling = Celsius(100)
+
+ v = corner
+ fmt.Println(v.String()) // dynamic dispatch
+ fmt.Println(v)
+
+ v = boiling.ToFahrenheit()
+ fmt.Println(v.String()) // dynamic dispatch
+ fmt.Println(v)
+ // STOP OMIT
+}
diff --git a/_content/talks/2012/goforc/point.go b/_content/talks/2012/goforc/point.go
new file mode 100644
index 0000000..2973d77
--- /dev/null
+++ b/_content/talks/2012/goforc/point.go
@@ -0,0 +1,22 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+
+type Point struct{ x, y int }
+
+func PointToString(p Point) string {
+ return fmt.Sprintf("Point{%d, %d}", p.x, p.y)
+}
+
+func (p Point) String() string { // HL
+ return fmt.Sprintf("Point{%d, %d}", p.x, p.y)
+}
+
+func main() {
+ p := Point{3, 5}
+ fmt.Println(PointToString(p)) // static dispatch // HL
+ fmt.Println(p.String()) // static dispatch // HL
+ fmt.Println(p)
+}
diff --git a/_content/talks/2012/goforc/stmts.go b/_content/talks/2012/goforc/stmts.go
new file mode 100644
index 0000000..ae6a5c7
--- /dev/null
+++ b/_content/talks/2012/goforc/stmts.go
@@ -0,0 +1,35 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+
+const digits = "0123456789abcdef"
+
+func itoa(x, base int) string {
+ // START OMIT
+ t := x
+ switch {
+ case x == 0:
+ return "0"
+ case x < 0:
+ t = -x
+ }
+ var s [32]byte
+ i := len(s)
+ for t != 0 { // Look, ma, no ()'s!
+ i--
+ s[i] = digits[t%base]
+ t /= base
+ }
+ if x < 0 {
+ i--
+ s[i] = '-'
+ }
+ return string(s[i:])
+ // STOP OMIT
+}
+
+func main() {
+ fmt.Println(itoa(-42, 2))
+}
diff --git a/_content/talks/2012/goforc/vars.go b/_content/talks/2012/goforc/vars.go
new file mode 100644
index 0000000..101eaa7
--- /dev/null
+++ b/_content/talks/2012/goforc/vars.go
@@ -0,0 +1,20 @@
+// +build ignore,OMIT
+
+package main
+
+// START1 OMIT
+var i int
+var p, q *Point
+var threshold float64 = 0.75
+
+// STOP1 OMIT
+
+// START2 OMIT
+var i = 42 // type of i is int
+var z = 1 + 2.3i // type of z is complex128
+// STOP2 OMIT
+
+func _() int {
+ i := 42 // type of i is int
+ return &i
+}
diff --git a/_content/talks/2012/goforc/worker1.go b/_content/talks/2012/goforc/worker1.go
new file mode 100644
index 0000000..585af16
--- /dev/null
+++ b/_content/talks/2012/goforc/worker1.go
@@ -0,0 +1,62 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+import "time"
+
+// START1 OMIT
+func main() {
+ start := time.Now()
+
+ in := make(chan int) // Channel on which work orders are received.
+ out := make(chan []int) // Channel on which results are returned.
+ go producer(in)
+ go worker(in, out) // Launch one worker. // HL
+ consumer(out, 100)
+
+ fmt.Println(time.Since(start))
+}
+
+// STOP1 OMIT
+
+// START2 OMIT
+func worker(in chan int, out chan []int) {
+ for {
+ order := <-in // Receive a work order. // HL
+ result := factor(order) // Do some work. // HL
+ out <- result // Send the result back. // HL
+ }
+}
+
+// STOP2 OMIT
+
+// START3 OMIT
+func producer(out chan int) {
+ for order := 0; ; order++ {
+ out <- order // Produce a work order. // HL
+ }
+}
+
+func consumer(in chan []int, n int) {
+ for i := 0; i < n; i++ {
+ result := <-in // Consume a result. // HL
+ fmt.Println("Consumed", result)
+ }
+}
+
+// STOP3 OMIT
+
+// factor returns a list containing x and its prime factors.
+func factor(x int) (list []int) {
+ list = append(list, x)
+ for f := 2; x >= f; f++ {
+ for x%f == 0 {
+ x /= f
+ list = append(list, f)
+ // Slow down so we can see what happens.
+ time.Sleep(50 * time.Millisecond)
+ }
+ }
+ return
+}
diff --git a/_content/talks/2012/goforc/worker2.go b/_content/talks/2012/goforc/worker2.go
new file mode 100644
index 0000000..f995e9b
--- /dev/null
+++ b/_content/talks/2012/goforc/worker2.go
@@ -0,0 +1,64 @@
+// +build ignore,OMIT
+
+package main
+
+import "fmt"
+import "time"
+
+func main() {
+ start := time.Now()
+
+ // START1 OMIT
+ in := make(chan int)
+ out := make(chan []int)
+ go producer(in)
+ // Launch 10 workers. // HL
+ for i := 0; i < 10; i++ { // HL
+ go worker(in, out) // HL
+ } // HL
+ consumer(out, 100)
+ // STOP1 OMIT
+
+ fmt.Println(time.Since(start))
+}
+
+// START2 OMIT
+func worker(in chan int, out chan []int) {
+ for {
+ order := <-in // Receive a work order. // HL
+ result := factor(order) // Do some work. // HL
+ out <- result // Send the result back. // HL
+ }
+}
+
+// STOP2 OMIT
+
+// START3 OMIT
+func producer(out chan int) {
+ for order := 0; ; order++ {
+ out <- order // Produce a work order. // HL
+ }
+}
+
+func consumer(in chan []int, n int) {
+ for i := 0; i < n; i++ {
+ result := <-in // Consume a result. // HL
+ fmt.Println("Consumed", result)
+ }
+}
+
+// STOP3 OMIT
+
+// factor returns a list containing x and its prime factors.
+func factor(x int) (list []int) {
+ list = append(list, x)
+ for f := 2; x >= f; f++ {
+ for x%f == 0 {
+ x /= f
+ list = append(list, f)
+ // Slow down so we can see what happens.
+ time.Sleep(50 * time.Millisecond)
+ }
+ }
+ return
+}
