From 0f5553f15dfdf195453d70911aa9f04062e0a903 Mon Sep 17 00:00:00 2001
From: Mark McGranaghan <mmcgrana@gmail.com>
Date: Sun, 16 Sep 2012 12:54:15 -0700
Subject: [PATCH] more
---
17-maps.go | 18 ++++++++++++++++++
18-guard.go | 16 ++++++++++++++++
19-nesting.go | 29 +++++++++++++++++++++++++++++
20-functions.go | 18 ++++++++++++++++++
4 files changed, 81 insertions(+)
create mode 100644 17-maps.go
create mode 100644 18-guard.go
create mode 100644 19-nesting.go
create mode 100644 20-functions.go
diff --git a/17-maps.go b/17-maps.go
new file mode 100644
index 0000000..56b8b9c
--- /dev/null
+++ b/17-maps.go
@@ -0,0 +1,18 @@
+package main
+
+import "fmt"
+
+func main() {
+ x := make(map[string]int)
+ x["this"] = 7
+ x["that"] = 13
+ fmt.Println(x)
+ fmt.Println(x["this"])
+ fmt.Println(x["missing"])
+ fmt.Println(len(x))
+ delete(x, "that")
+ fmt.Println(x["that"])
+ fmt.Println(len(x))
+ _, present := x["that"]
+ fmt.Println(present)
+}
diff --git a/18-guard.go b/18-guard.go
new file mode 100644
index 0000000..ab39ecb
--- /dev/null
+++ b/18-guard.go
@@ -0,0 +1,16 @@
+package main
+
+import "fmt"
+
+func main() {
+ x := make(map[string]string)
+ x["here"] = "yep"
+ if name, ok := x["not here"]; ok {
+ fmt.Println(name)
+ } else {
+ fmt.Println("missing")
+ }
+ if name, ok := x["here"]; ok {
+ fmt.Println(name)
+ }
+}
diff --git a/19-nesting.go b/19-nesting.go
new file mode 100644
index 0000000..952d351
--- /dev/null
+++ b/19-nesting.go
@@ -0,0 +1,29 @@
+package main
+
+import "fmt"
+
+func main() {
+ elements := map[string]map[string]string{
+ "He": map[string]string{
+ "name":"Helium",
+ "state":"gas",
+ },
+ "Li": map[string]string{
+ "name":"Lithium",
+ "state":"solid",
+ },
+ "Be": map[string]string{
+ "name":"Beryllium",
+ "state":"solid",
+ },
+ }
+
+ fmt.Println(elements)
+ fmt.Println()
+
+ li := elements["Li"]
+ fmt.Println(li)
+ fmt.Println()
+
+ fmt.Println(li["name"], li["state"])
+}
diff --git a/20-functions.go b/20-functions.go
new file mode 100644
index 0000000..a80bfc3
--- /dev/null
+++ b/20-functions.go
@@ -0,0 +1,18 @@
+package main
+
+import "fmt"
+
+func avg(vals []float64) float64 {
+ total := 0.0
+ for _, val := range vals {
+ total += val
+ }
+ return total / float64(len(vals))
+}
+
+func main() {
+ input := []float64{98,93,77,82,83}
+ fmt.Println(input)
+ output := avg(input)
+ fmt.Println(output)
+}