Question

我在golang中迭代一个切片并逐个挑选元素。我遇到的问题是，在删除项目后，我应该重置索引或从头开始，但我不确定如何。

package main

import (
    "fmt"
)

func main() {
    x := []int{1, 2, 3, 7, 16, 22, 17, 42}
    fmt.Println("We will start out with", x)

    for i, v := range x {
        fmt.Println("The current value is", v)
        x = append(x[:i], x[i+1:]...)
        fmt.Println("And after it is removed, we get", x)
    }
}

将返回以下内容：

We will start out with [1 2 3 7 16 22 17 42]
The current value is 1
And after it is removed, we get [2 3 7 16 22 17 42]
The current value is 3
And after it is removed, we get [2 7 16 22 17 42]
The current value is 16
And after it is removed, we get [2 7 22 17 42]
The current value is 17
And after it is removed, we get [2 7 22 42]
The current value is 42
panic: runtime error: slice bounds out of range

goroutine 1 [running]:
main.main()
    /tmp/sandbox337422483/main.go:13 +0x460

这样做的惯用方法是什么？我马上就是来自Python的i - 或i = i-1。

Answer 1

我个人更喜欢创建副本。但如果你改变range部分：

，也可以不用

package main

import (
    "fmt"
)

func main() {
    x := []int{1, 2, 3, 7, 16, 22, 17, 42}
    fmt.Println("We will start out with", x)

    for i := 0; i < len(x);  {
        fmt.Println("The current value is", x[i])
        x = append(x[:i], x[i+1:]...)
        fmt.Println("And after it is removed, we get", x)
    }
}

迭代切片并重置索引 - golang

1 个答案: