0081-Go-切片 slice

环境

• Time 2022-08-23
• Go 1.19

前言

说明

参考：https://gobyexample.com/slices

目标

使用 Go 语言的切片类型。

新建切片类型

package main

import "fmt"

func main() {

    slice := make([]string, 3)
    fmt.Println("emp:", slice)
}

修改和获取元素

package main

import "fmt"

func main() {

    slice := make([]string, 3)
    fmt.Println("emp:", slice)

    slice[0] = "a"
    slice[1] = "b"
    slice[2] = "c"
    fmt.Println("set:", slice)
    fmt.Println("get:", slice[2])
}

获取长度

package main

import "fmt"

func main() {

    slice := make([]string, 3)
    fmt.Println("emp:", slice)

    slice[0] = "a"
    slice[1] = "b"
    slice[2] = "c"

    fmt.Println("len:", len(slice))
}

追加元素

package main

import "fmt"

func main() {

    slice := make([]string, 3)
    fmt.Println("emp:", slice)

    slice[0] = "a"
    slice[1] = "b"
    slice[2] = "c"

    fmt.Println("len:", len(slice))

    slice = append(slice, "d")
    slice = append(slice, "e", "f")
    fmt.Println("apd:", slice)
}

切片拷贝

package main

import "fmt"

func main() {

    slice := make([]string, 3)

    slice[0] = "a"
    slice[1] = "b"
    slice[2] = "c"

    slice = append(slice, "d")
    slice = append(slice, "e", "f")

    dst := make([]string, len(slice))
    copy(dst, slice)
    fmt.Println("cpy:", dst)
}

截取

package main

import "fmt"

func main() {

    slice := make([]string, 3)

    slice[0] = "a"
    slice[1] = "b"
    slice[2] = "c"

    slice = append(slice, "d")
    slice = append(slice, "e", "f")

    l := slice[2:5]
    fmt.Println("sl1:", l)
    // 从头开始
    l = slice[:5]
    fmt.Println("sl2:", l)
    // 直到末尾
    l = slice[2:]
    fmt.Println("sl3:", l)
}

新建并初始化切片

package main

import "fmt"

func main() {

    t := []string{"g", "h", "i"}
    fmt.Println("dcl:", t)
}

二维切片

package main

import "fmt"

func main() {

    twoD := make([][]int, 3)
    for i := 0; i < 3; i++ {
        innerLen := i + 1
        twoD[i] = make([]int, innerLen)
        for j := 0; j < innerLen; j++ {
            twoD[i][j] = i + j
        }
    }
    fmt.Println("2d: ", twoD)
}

总结

使用 Go 语言的切片类型。

附录