切片含义

切片的本质就是对底层数组的封装，它包含了三个信息：底层数组的指针、切片的长度（len）和切片的容量（cap）。

切片练习题

/*
@Time : 2020-03-12 14:35
@Author : ianthony
@File : main
@Software: GoLand
*/
package main

import "fmt"

func main() {

	// 定义一个切片
	var s1 []int
	var s2 []string

	// 切片初始哈
	s1 = []int{1, 2, 3}
	s2 = []string{"海淀", "张江", "朝阳"}
	fmt.Printf("len:%d,cap:%d\n", len(s1), cap(s1))
	fmt.Printf("len:%d,cap:%d\n", len(s2), cap(s2))

	// 将数组切割
	a1 := [...]int{1, 2, 3, 4, 5, 6, 7, 8, 445, 631}
	b1 := a1[0:4]
	fmt.Println(b1)

	//切片再切片
	a := [...]string{"北京", "上海", "广州", "深圳", "成都", "重庆"}
	fmt.Printf("a:%v type:%T len:%d  cap:%d\n", a, a, len(a), cap(a))
	b := a[1:3]
	fmt.Printf("b:%v type:%T len:%d  cap:%d\n", b, b, len(b), cap(b))
	c := b[1:5]
	fmt.Printf("c:%v type:%T len:%d  cap:%d\n", c, c, len(c), cap(c))

	// 生成一个切片
	a2 := make([]int, 2, 10)
	fmt.Println(a2)
	fmt.Println(len(a2))
	fmt.Println(cap(a2))
	// 切片赋值
	a2[1] = 2
	fmt.Println(a2)

	var s []int
	var t []string
	s = append(s, 1, 2, 3, 4)
	t = append(t, "一", "二", "三")
	fmt.Println(s)
	fmt.Println(t)
}