array

Array/array_test.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestArray(t *testing.T) {
+	fmt.Println("123")
+}
+
+func TestSum(t *testing.T) {
+	x := [...]int{1, 2, 3}
+	sum := 0
+	for _, v := range x {
+		sum += v
+	}
+	fmt.Println(sum)
+}
+
+//Newsplit 切割字符串
+//example:
+//abc,b=>[ac]
+func Newsplit(str, sep string) (des []string) {
+	index := strings.Index(str, sep)
+	for index > -1 {
+		sectionBefor := str[:index]
+		des = append(des, sectionBefor)
+		str = str[index+1:]
+		index = strings.Index(str, sep)
+	}
+	//最后1
+	des = append(des, str)
+	return
+}
+
+//测试用例1：以字符分割
+func TestSplit(t *testing.T) {
+	got := Newsplit("123N456", "N")
+	want := []string{"123", "456"}
+	//DeepEqual比较底层数组
+	if !reflect.DeepEqual(got, want) {
+		//如果got和want不一致说明你写得代码有问题
+		t.Errorf("The values of %v is not %v\n", got, want)
+	}
+
+}
+
+//测试用例2：以标点符号分割
+func TestPunctuationSplit(t *testing.T) {
+	got := Newsplit("a:b:c", ":")
+	want := []string{"a", "b", "c"}
+	if !reflect.DeepEqual(got, want) {
+		t.FailNow() //出错就stop别往下测了！
+	}
+
+}

Array/main.go

@@ -0,0 +1,26 @@
+package main
+
+import "fmt"
+
+func main() {
+	var a1 [3]bool
+
+	var a2 = [...]int{1, 2, 3}
+	fmt.Printf("a1: %T\n", a1)
+	fmt.Println(a2)
+
+	a3 := [...]int{1: 1, 4: 2}
+	fmt.Println(a3)
+
+	a := [3][2]string{
+		{"北京", "上海"},
+		{"广州", "深圳"},
+		{"成都", "重庆"},
+	}
+	for _, v1 := range a {
+		for _, v2 := range v1 {
+			fmt.Printf("%s\t", v2)
+		}
+		fmt.Println()
+	}
+}

Demo/main.go

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

Slice/main.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"fmt"
+	"sort"
+)
+
+func main() {
+	var a []string
+	b := []int{}
+	c := []bool{true, false}
+	fmt.Println(a)
+	fmt.Println(b)
+	fmt.Println(c)
+	fmt.Println(a == nil)
+	fmt.Println("===切片===")
+
+	test := []int{5, 4, 3, 8, 6}
+	testSlice1 := test[1:3]
+	fmt.Printf("slice1:%v, len: %v, caps: %v\n", testSlice1, len(testSlice1), cap(testSlice1))
+
+	//切片再切片的结果起始位置在上一个切片的起始位置，high上限未原始数组的容量
+	//我的理解：a [1,2,3,4,5,6]
+	//   切片：b=a[2,4] = [3,4]  length=4-2=2 capacity=数组[3,4,5,6]的容量=4
+	testSlice2 := testSlice1[0:4]
+	fmt.Printf("slice2:%v, len: %v, caps: %v\n", testSlice2, len(testSlice2), cap(testSlice2))
+
+	//capacity=max-low=3 length=high-low=2
+	testSlice3 := test[2:4:5]
+	fmt.Printf("slice3:%v, len:%v, cap:%v\n", testSlice3, len(testSlice3), cap(testSlice3))
+
+	fmt.Println("===make===")
+
+	sliceMake := make([]bool, 2, 10)
+	fmt.Printf("make: %v, len: %v, cap: %v\n", sliceMake, len(sliceMake), cap(sliceMake))
+
+	fmt.Println("===赋值===")
+
+	s1 := make([]int, 3) //[0 0 0]
+	s2 := s1             //将s1直接赋值给s2，s1和s2共用一个底层数组
+	s2[0] = 100
+	fmt.Println(s1) //[100 0 0]
+	fmt.Println(s2) //[100 0 0]
+
+	s11 := []int{1, 3, 5, 7, 9, 0, 2, 4, 6, 8}
+	s12 := make([]int, 5, 5)
+	copy(s12, s11) //数据复制到另一片空间
+	s11[0] = 100
+	fmt.Println(s11)
+	fmt.Println(s12)
+
+	fmt.Println("===遍历===")
+	slice4range := []int{1, 3, 5, 6, 4, 2}
+	for i := 0; i < len(slice4range); i++ {
+		fmt.Printf("%v ", slice4range[i])
+	}
+	fmt.Println()
+	for index, value := range slice4range {
+		fmt.Println(index, value)
+	}
+
+	fmt.Println("===删除===")
+	sliceDel := []int{1, 2, 3, 4, 5, 6}
+	sliceDel = append(sliceDel[:2], sliceDel[3:]...)
+	fmt.Println(sliceDel)
+
+	var m = make([]string, 5, 10)
+	for i := 0; i < 10; i++ {
+		m = append(m, fmt.Sprintf("%v", i))
+	}
+	fmt.Println(m)
+
+	var mm = [...]int{3, 7, 8, 9, 1}
+	ms := mm[0:len(mm)]
+
+	sort.Slice(ms, func(i, j int) bool {
+		return ms[i] < ms[j]
+	})
+	
+	fmt.Printf("Sort: %v\n%v\n", mm, ms)
+}