arrays - 试图添加到 slice 的索引超出范围

Question

var bar string
var i int
var a []string
for foo, _ := reader.NextWord(); foo != bar; foo, _ = reader.NextWord() {
    bar = foo
    fmt.Print(foo)
    a[i] = foo
    i++
}

这不应该是创建一个 nil slice ，然后将值添加到适当的位置吗？我一直在获取超出范围的索引，所以我认为它不会添加到 a[i]...

首先检查长度

if len(a) > 0 {
    a[i] = foo
}

似乎有帮助，但没有得到我预期的结果。我会继续玩。

更新:我确实最终使用了附加...我打算更新这个线程，但谢谢你们。

package main

import (
    "fmt"
    "log"
    "os"
    "strings"

    "github.com/steven-ferrer/gonsole"
)

func main() {
    file, err := os.Open("test.txt")
    if err != nil {
        log.Println(err)
    }
    defer file.Close()

    reader := gonsole.NewReader(file)

    // cycle through
    var bar string
    var i int

    var quality []string = make([]string, 0)
    var tempName []string = make([]string, 0)
    var name []string = make([]string, 0)

    for foo, _ := reader.NextWord(); foo != bar; foo, _ = reader.NextWord() {
        bar = foo

        if strings.Contains(foo, "(normal)") {
            quality = append(quality, "normal")
            for state := 0; state < 1; foo, _ = reader.NextWord() {
                if foo == "|" {
                    state = 1
                }
                tempName = append(tempName, foo)
            }
            nameString := strings.Join(tempName, "")
            name = append(name, nameString)
        } else if strings.Contains(foo, "(unique)") {
            quality = append(quality, "unique")
            for state := 0; state < 1; foo, _ = reader.NextWord() {
                if foo == "|" {
                    state = 1
                }
                tempName = append(tempName, foo)
            }
            nameString := strings.Join(tempName, "")
            name = append(name, nameString)
        } else if strings.Contains(foo, "(set)") {
            quality = append(quality, "set")
            for state := 0; state < 1; foo, _ = reader.NextWord() {
                if foo == "|" {
                    state = 1
                }
                tempName = append(tempName, foo)
            }
            nameString := strings.Join(tempName, "")
            name = append(name, nameString)
        }
        if tempName != nil {
            tempName = nil // clear tempName
        }
        i++
    }

Answer 1

您的 slice a 需要使用 make 进行分配。

var a []string = make([]string, n)

其中 n 是 slice 的大小。