亲宝软件园·资讯

展开

Go数组 切片 映射

Livingbody 人气:0

Arrays (数组), Slices (切片) 和 Maps (映射) 是常见的一类数据结构

1.Arrays (数组)

初始化

package main

import (
	"fmt"
)

func main() {
	var scores [10]int
	scores[0] = 99
	fmt.Printf("scoers:%d\n", scores)
	socres_english := [4]int{99, 100, 100, 99}
	for index, value := range socres_english {
		fmt.Printf("%d\t %d", index, value)
	}
}

Starting: C:\Users\livingbody\go\bin\dlv.exe dap --check-go-version=false --listen=127.0.0.1:14487 from c:\Users\livingbody\goworkspace\hello
DAP server listening at: 127.0.0.1:14487
Type 'dlv help' for list of commands.
scoers:[99 0 0 0 0 0 0 0 0 0]
0     991     1002     1003     99
Process 14356 has exited with status 0
Detaching
dlv dap (15128) exited with code: 0

2.切片

切片是轻量的包含并表示数组的一部分的结构。

2.1 make创建切片

# 即创建长度10,容量0的切片
score := make([]int, 0, 10)
package main

import (
	"fmt"
)

func main() {
	var scores [10]int
	scores[0] = 99
	fmt.Printf("scoers:%d\n", scores)
	socres_english := [4]int{99, 100, 100, 99}
	for index, value := range socres_english {
		fmt.Printf("%d\t %d\n", index, value)
	}
	score_math := make([]int, 0, 10)
	score_math = append(score_math, 100)
	fmt.Println(score_math)
	fmt.Println(score_math[0])
	score_math = score_math[0:8]
	score_math[7] = 99
	fmt.Println(score_math)
	c := cap(score_math)
	fmt.Println(c)
	for i := 0; i < 25; i++ {
		score_math = append(score_math, i)
		if cap(score_math) != c {
			c = cap(score_math)
			fmt.Println(c)
		}
	}
}

输出:

Type 'dlv help' for list of commands.
scoers:[99 0 0 0 0 0 0 0 0 0]
0     99
1     100
2     100
3     99
[100]
100
[100 0 0 0 0 0 0 99]
10
20
40
Process 20448 has exited with status 0
Detaching
dlv dap (7204) exited with code: 0

3.映射Map

就好比其他语言中的 hash 表或者字典。它们的工作方式就是:定义键和值,并且可以获取,设置和删除其中的值。

同样通过make方法创建。

package main

import (
	"fmt"
)

func main() {
	lookup := make(map[string]int)
	lookup["goku"] = 9001
	power, exists := lookup["vegeta"]
	fmt.Println(power, exists)
	total := len(lookup)
	fmt.Println(total)
	delete(lookup, "goku")
	fmt.Println(len(lookup))
}

Starting: C:\Users\livingbody\go\bin\dlv.exe dap --check-go-version=false --listen=127.0.0.1:14812 from c:\Users\livingbody\goworkspace\hello
DAP server listening at: 127.0.0.1:14812
Type 'dlv help' for list of commands.
0 false
1
0
Process 924 has exited with status 0
Detaching
dlv dap (700) exited with code: 0

迭代

for key, value := range lookup {
  ...
}

注意:

map迭代没有顺序

加载全部内容

相关教程
猜你喜欢
用户评论