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package main
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import (
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"fmt"
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"sort"
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)
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func main() {
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var a []string //声明一个字符串切片未初始化
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b := []int{} //声明一个整型切片并初始化
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c := []bool{true, false} //声明一个整型切片并初始化
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fmt.Println(a)
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fmt.Println(b)
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fmt.Println(c)
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fmt.Println(a == nil)
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fmt.Println("===切片===")
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test := []int{5, 4, 3, 8, 6}
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testSlice1 := test[1:3]
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fmt.Printf("slice1:%v, len: %v, caps: %v\n", testSlice1, len(testSlice1), cap(testSlice1))
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//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
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//我的理解：a [1,2,3,4,5,6]
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// 切片：b=a[2,4] = [3,4] length=4-2=2 capacity=数组[3,4,5,6]的容量=4
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testSlice2 := testSlice1[0:4]
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fmt.Printf("slice2:%v, len: %v, caps: %v\n", testSlice2, len(testSlice2), cap(testSlice2))
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//capacity=max-low=3 length=high-low=2
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testSlice3 := test[2:4:5]
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fmt.Printf("slice3:%v, len:%v, cap:%v\n", testSlice3, len(testSlice3), cap(testSlice3))
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fmt.Println("===make===")
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sliceMake := make([]bool, 2, 10)
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fmt.Printf("make: %v, len: %v, cap: %v\n", sliceMake, len(sliceMake), cap(sliceMake))
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fmt.Println("===赋值===")
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s1 := make([]int, 3) //[0 0 0]
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s2 := s1 //将s1直接赋值给s2，s1和s2共用一个底层数组
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s2[0] = 100
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fmt.Println(s1) //[100 0 0]
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fmt.Println(s2) //[100 0 0]
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s11 := []int{1, 3, 5, 7, 9, 0, 2, 4, 6, 8}
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s12 := make([]int, 5, 5)
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copy(s12, s11) //数据复制到另一片空间
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s11[0] = 100
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fmt.Println(s11)
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fmt.Println(s12)
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fmt.Println("===遍历===")
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slice4range := []int{1, 3, 5, 6, 4, 2}
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for i := 0; i < len(slice4range); i++ {
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fmt.Printf("%v ", slice4range[i])
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}
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fmt.Println()
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for index, value := range slice4range {
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fmt.Println(index, value)
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}
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fmt.Println("===删除===")
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sliceDel := []int{1, 2, 3, 4, 5, 6}
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sliceDel = append(sliceDel[:2], sliceDel[3:]...)
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fmt.Println(sliceDel)
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var m = make([]string, 5, 10)
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for i := 0; i < 10; i++ {
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m = append(m, fmt.Sprintf("%v", i))
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}
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fmt.Println(m)
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var mm = [...]int{3, 7, 8, 9, 1}
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ms := mm[0:len(mm)]
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sort.Slice(ms, func(i, j int) bool {
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return ms[i] < ms[j]
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})
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fmt.Printf("Sort: %v\n%v\n", mm, ms)
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}
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