合并最新的学习代码

.idea/go.iml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module version="4">
+  <component name="Go" enabled="true" />
+</module>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

.idea/workspace.xml

@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="ALL" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="495445f0-1eca-47b4-946d-d66cf898be6c" name="Changes" comment="" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Go File" />
+      </list>
+    </option>
+  </component>
+  <component name="GOROOT" url="file:///usr/local/go" />
+  <component name="ProjectColorInfo">{
+  &quot;associatedIndex&quot;: 7
+}</component>
+  <component name="ProjectId" id="2lF3CQOFOFWwbyYijFatmfemAXC" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "DefaultGoTemplateProperty": "Go File",
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "RunOnceActivity.go.formatter.settings.were.checked": "true",
+    "RunOnceActivity.go.migrated.go.modules.settings": "true",
+    "RunOnceActivity.go.modules.automatic.dependencies.download": "true",
+    "RunOnceActivity.go.modules.go.list.on.any.changes.was.set": "true",
+    "go.import.settings.migrated": "true",
+    "go.sdk.automatically.set": "true",
+    "last_opened_file_path": "/Users/chenqiang/workspace/study/go",
+    "node.js.detected.package.eslint": "true",
+    "node.js.selected.package.eslint": "(autodetect)",
+    "nodejs_package_manager_path": "npm",
+    "settings.editor.selected.configurable": "preferences.pluginManager"
+  }
+}]]></component>
+  <component name="SharedIndexes">
+    <attachedChunks>
+      <set>
+        <option value="bundled-gosdk-33c477a475b1-b97fc8a1e17c-org.jetbrains.plugins.go.sharedIndexes.bundled-GO-241.14494.238" />
+        <option value="bundled-js-predefined-1d06a55b98c1-74d2a5396914-JavaScript-GO-241.14494.238" />
+      </set>
+    </attachedChunks>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="3" />
+  </component>
+  <component name="VgoProject">
+    <settings-migrated>true</settings-migrated>
+  </component>
+  <component name="XDebuggerManager">
+    <breakpoint-manager>
+      <breakpoints>
+        <line-breakpoint enabled="true" type="DlvLineBreakpoint">
+          <url>file://$PROJECT_DIR$/tour/tour.go</url>
+          <line>6</line>
+          <option name="timeStamp" value="1" />
+        </line-breakpoint>
+      </breakpoints>
+    </breakpoint-manager>
+  </component>
+</project>

flysnow/ch02/go.mod

@@ -0,0 +1,3 @@
+module flysnow/ch02
+
+go 1.23.0

flysnow/ch02/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	var f32 float32 = 2.2
+	var f64 float64 = 10.2345
+	fmt.Println("f32 is", f32, ", f64 is", f64)
+	var bf bool = false
+	var bt bool = true
+	fmt.Println("bf is", bf, ", bt is", bt)
+	var s1 string = "Hello"
+	var s2 string = "世界"
+	fmt.Println("s1 is", s1, ", s2 is", s2)
+	fmt.Println("s1+s2=", s1+s2)
+	// 零值
+	var zi int
+	var zf float64
+	var zb bool
+	var zs string
+	fmt.Println("zi is", zi, ", zf is", zf, "zb is", zb, ", zs is", zs)
+	i := 3.14
+	pi := &i
+	fmt.Println(*pi)
+
+	// 常量iota
+	const (
+		one = iota + 1
+		two
+		three
+		four
+	)
+	fmt.Println(one, two, three, four)
+
+	// string
+	j := 5
+	i2s := strconv.Itoa(j)
+	s2i, err := strconv.Atoi(i2s)
+	fmt.Println(i2s, s2i, err)
+	f2s := strconv.FormatFloat(f64, 'e', -1, 32)
+	fmt.Println(f2s)
+	// 判断字符串开头是否为“H”
+	fmt.Println(strings.HasPrefix(f2s, "H"))
+	// 查找字符串
+	fmt.Println(strings.Index(f2s, "e"))
+	// 全部转大写
+	fmt.Println(strings.ToUpper(f2s))
+}

flysnow/ch03/go.mod

@@ -0,0 +1,3 @@
+module flysnow/ch03
+
+go 1.23.0

flysnow/ch03/main.go

@@ -0,0 +1,74 @@
+package main
+
+import "fmt"
+
+func main() {
+	i := 10
+	if i > 10 {
+		fmt.Println("i > 10")
+	} else {
+		fmt.Println("i <= 10")
+	}
+
+	i = 6
+	if i > 10 {
+		fmt.Println("i > 10")
+	} else if i > 5 && i <= 10 {
+		fmt.Println("5 < i <= 10")
+	} else {
+		fmt.Println("i <= 5")
+	}
+
+	switch {
+	case i > 10:
+		fmt.Println("i > 10")
+	case i > 5 && i <= 10:
+		fmt.Println("5 < i <= 10")
+	default:
+		fmt.Println("i <= 5")
+	}
+
+	switch j := 1; j {
+	case 1:
+		fallthrough
+	case 2:
+		fmt.Println(j)
+	default:
+		fmt.Println("没有匹配")
+	}
+
+	sum := 0
+	for i := 1; i <= 100; i++ {
+		sum += i
+	}
+	fmt.Println(sum)
+
+	sum = 0
+	i = 1
+	for i <= 100 {
+		sum += i
+		i++
+	}
+	fmt.Println("the sum is", sum)
+
+	sum = 0
+	i = 1
+	for {
+		sum += i
+		i++
+		if i > 100 {
+			break
+		}
+	}
+	fmt.Println("the sum is", sum)
+
+	sum = 0
+	for i := 0; i < 100; i++ {
+		if i%2 != 0 {
+			continue
+		}
+		sum += i
+	}
+	fmt.Println("the sum is", sum)
+
+}

flysnow/ch04/go.mod

@@ -0,0 +1,3 @@
+module flysnow/ch04
+
+go 1.23.0

flysnow/ch04/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"unicode/utf8"
+)
+
+func main() {
+	array := []string{"a", "b", "c", "d", "e"}
+	fmt.Println(array)
+	for i := 0; i < len(array); i++ {
+		fmt.Printf("数组索引: %d，对应值: %s\n", i, array[i])
+	}
+	for i, v := range array {
+		fmt.Printf("数组索引: %d, 对应值: %s\n", i, v)
+	}
+	for _, v := range array {
+		fmt.Printf("数组值: %s\n", v)
+	}
+	// 切片slice
+	slice := array[2:4] // 包含索引2，不包含索引4
+	fmt.Println(slice)
+	slice1 := make([]string, 4)
+	slice2 := make([]string, 4, 8)
+	slice2 = append(slice1, "f")
+	fmt.Println(slice2)
+	// 映射map
+	nameAgeMap := make(map[string]int)
+	nameAgeMap["Snowfay"] = 20
+	fmt.Println(nameAgeMap)
+	age := nameAgeMap["Snowfay"]
+	fmt.Println(age)
+	age, ok := nameAgeMap["Snowfay"]
+	if ok {
+		fmt.Println(age)
+	} else {
+		fmt.Println(ok)
+	}
+	nameAgeMap["飞雪无情"] = 50
+	fmt.Println(nameAgeMap)
+	delete(nameAgeMap, "飞雪无情")
+	fmt.Println(nameAgeMap)
+	nameAgeMap["Hello"] = 22
+	nameAgeMap["Allen"] = 33
+	for k, v := range nameAgeMap {
+		fmt.Println("Key is", k, "Value is", v)
+	}
+	fmt.Println(len(nameAgeMap))
+	// string
+	s := "Hello飞雪无情"
+	bs := []byte(s)
+	fmt.Println(bs)
+	fmt.Println(s[0], s[1], s[15])
+	fmt.Println(len(s))
+	fmt.Println(utf8.RuneCountInString(s))
+	for i, r := range s {
+		fmt.Printf("%d %c\n", i, r)
+	}
+}

flysnow/ch05/go.mod

@@ -0,0 +1,3 @@
+module flysnow/ch05
+
+go 1.23.0

flysnow/ch05/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+)
+
+type Age uint
+
+func (age Age) String() {
+	fmt.Println("the age is", age)
+}
+
+func (age *Age) Modify() {
+	*age = Age(30)
+}
+
+func main() {
+	age := Age(25)
+	age.String()
+	age.Modify()
+	age.String()
+
+	sm := Age.String
+	sm(age)
+
+	result, err := sum(-1, 2)
+	if err != nil {
+		fmt.Println(err)
+	} else {
+		fmt.Println(result)
+	}
+	fmt.Println(sum1(1, 2))
+	fmt.Println(sum1(1, 2, 3))
+	fmt.Println(sum1(1, 2, 3, 4))
+
+	sum2 := func(a, b int) int {
+		return a + b
+	}
+	fmt.Println(sum2(1, 2))
+	c1 := colsure()
+	fmt.Println(c1())
+	fmt.Println(c1())
+	fmt.Println(c1())
+}
+
+func colsure() func() int {
+	i := 0
+	return func() int {
+		i++
+		return i
+	}
+}
+
+func sum(a int, b int) (sum int, err error) {
+	if a < 0 || b < 0 {
+		return 0, errors.New("a或者b不能是负数")
+	}
+	sum = a + b
+	err = nil
+	return
+}
+
+func sum1(params ...int) int {
+	sum := 0
+	for _, i := range params {
+		sum += i
+	}
+	return sum
+}

flysnow/ch06/go.mod

@@ -0,0 +1,3 @@
+module flysnow/ch06
+
+go 1.23.0

flysnow/ch06/main.go

@@ -0,0 +1,10 @@
+package main
+
+type person struct {
+	name string
+	age  uint
+}
+
+func main() {
+
+}

flysnow/tour/go.mod

@@ -0,0 +1,3 @@
+module flysnow/tour
+
+go 1.23.0

flysnow/tour/tour.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello world")
+}

helloworld/.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

helloworld/.idea/go.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

helloworld/.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/go.iml" filepath="$PROJECT_DIR$/.idea/go.iml" />
+    </modules>
+  </component>
+</project>

helloworld/greetings/go.mod

@@ -0,0 +1,3 @@
+module example.com/greetings
+
+go 1.16

helloworld/greetings/greetings.go

@@ -0,0 +1,8 @@
+package greetings
+
+import "fmt"
+
+func Hello(name string) string {
+	message := fmt.Sprintf("Hi, %v. Welcome!", name)
+	return message
+}

helloworld/hello/go.mod

@@ -0,0 +1,7 @@
+module example.com/hello
+
+go 1.23.0
+
+replace example.com/greetings => ../greetings
+
+require example.com/greetings v0.0.0-00010101000000-000000000000

helloworld/hello/hello.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"example.com/greetings"
+	"fmt"
+)
+
+func main() {
+	message := greetings.Hello("Gladys")
+	fmt.Println(message)
+}