GoStudy/Slice/main.go

package main

import (
	"fmt"
	"sort"
)

func main() {
	var a []string           //声明一个字符串切片
	b := []int{}             //声明一个整型切片并初始化
	c := []bool{true, false} //声明一个整型切片并初始化
	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)
}