add riddles

meetup_2018_11_20/go-quizzes/1.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+)
+
+// https://twitter.com/davecheney/status/1053490060492890118
+func main() {
+	one, two, three := 0.1, 0.2, 0.3
+	fmt.Println(one+two > three)
+}
+
+// True
+// False
+// 0.3

meetup_2018_11_20/go-quizzes/10.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+func four(s []int) {
+	s = append(s, 4)
+}
+
+// https://twitter.com/davecheney/status/1019359774264082432
+func main() {
+	s := []int{1, 2, 3}
+	four(s)
+	fmt.Println(s)
+}
+
+// [ 1 2 3 4 ]
+// [ 4 ]
+// [ 1 2 3 ]
+// doesn't compile

meetup_2018_11_20/go-quizzes/2.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+// https://twitter.com/davecheney/status/1056487208989773824
+func main() {
+	ಠ_ಠ := '7'
+	fmt.Println(ಠ_ಠ)
+}
+
+// ಠ_ಠ
+// 55
+// 7
+// dude, that won't compile

meetup_2018_11_20/go-quizzes/3.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+)
+
+// https://twitter.com/davecheney/status/1053419185680744448
+func main() {
+	var a []int
+	b := a[:]
+	fmt.Println(b == nil)
+}
+
+// true
+// false
+// panic on line 9

meetup_2018_11_20/go-quizzes/4.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+)
+
+// https://twitter.com/davecheney/status/1042396099443453952
+func main() {
+	for i := 1; i < 10; i++ {
+		fmt.Println("Hello!")
+	}
+}
+
+// Yes
+// No
+// Only on Windows

meetup_2018_11_20/go-quizzes/5.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"crypto/sha1"
+	"fmt"
+)
+
+// https://twitter.com/davecheney/status/1041526653141147654
+func main() {
+	input := []byte("Hello, playground")
+	hash := sha1.Sum(input)[:5]
+	fmt.Println(hash)
+}
+
+// 461ec8144f
+// [70 30 200 20 79]
+// nothing, doesn't compile

meetup_2018_11_20/go-quizzes/6.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+)
+
+// https://twitter.com/davecheney/status/1039997464361623552
+func main() {
+	fmt.Println(string('7' << 1))
+}
+
+// 7
+// 14
+// n
+// doesn't compile

meetup_2018_11_20/go-quizzes/7.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"sync"
+)
+
+// https://twitter.com/davecheney/status/1031699003803463680
+func main() {
+	var wg sync.Waitgroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		runtime.Goexit()
+	}()
+	wg.Wait()
+	fmt.Println("Hello, playground")
+}
+
+// Hello, playground
+// It panics
+// Nothing, it don'st compile

meetup_2018_11_20/go-quizzes/8.go

@@ -0,0 +1,17 @@
+package main
+
+import "fmt"
+
+type Q struct{}
+
+func (Q) Hola() string { return "Bueno" }
+
+// https://twitter.com/davecheney/status/1031389514890006528
+func main() {
+	var q Q
+	fmt.Println(Q.Hola(q))
+}
+
+// Bueno
+// Good
+// Nada, it won't compile

meetup_2018_11_20/go-quizzes/9.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"fmt"
+)
+
+// https://twitter.com/davecheney/status/1027826127841112064
+func main() {
+	fmt.Println(1)
+}
+
+// "1"
+// doesn't compile
+// 1