试图添加到切片的索引超出范围

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++
}

Shouldn't this be creating a nil slice and then adding the value to the appropriate place? I keep getting index out of range so I assume it's not adding to a[i]...

Checking length first with

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

seems to help, but not getting the results I expected. I'll keep playing around.

Update: I did end up using append... I meant to update this thread but thank you both.

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

Your slice a needs to be allocated utilizing make.

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

where n is the size of the slice.