如何检查附加切片是否等于字符串？

Question

So the plan is to have a string such as "a" in the slice, and once that turns into "a100" for example then stop running a for loop which is adding numbers to the end of it. When I try the code below it says "(mismatched types []string and string)", is this because I have to convert the slice into a string? If so, how do I do that? Thanks.

package main

import "fmt"

func main() {
    var s []string
    s = append(s, "a")
    fmt.Println(s)
    for i := 0; i <= 1000; i++ {
        s = append(s, i)
        if s == "a10" {
            fmt.Println("Worked", s)
        } else {
            fmt.Println(s)
        }
    }
}

Answer 1

You can convert an []string to a string` by doing:

import "strings"

//...

if strings.Join(s, "") == "a10" {
      fmt.Println("Worked", s)
} else {
      fmt.Println(s)
}

You also need to convert i (an int) to a string, most likely you would use strconv.Itoa. In the end, you code would look something like this: https://play.golang.org/p/gD5b5XFimJ

package main

import (
    "fmt"
    "strconv"
    "strings"
)

func main() {
    var s []string
    s = append(s, "a")
    fmt.Println(s)
    for i := 0; i <= 1000; i++ {
        s = append(s, strconv.Itoa(i))
        if strings.Join(s, "") == "a01" {
            fmt.Println("Worked", s)
            return
        } else {
            fmt.Println(s)
        }
    }
}

Although, you could also just not use an array and append to the string (or an []byte) directly...

package main

import (
    "fmt"
    "strconv"
)

func main() {
    var s := "a"
    fmt.Println(s)
    for i := 0; i <= 1000; i++ {
        s += strconv.Itoa(i)
        if s == "a01" {
            fmt.Println("Worked", s)
            return
        } else {
            fmt.Println(s)
        }
    }
}

To reset the array every time, just make the main method:

for i := 0; i <= 1000; i++ {
    s := []string{"a"}
    s = append(s, strconv.Itoa(i))
    if strings.Join(s, "") == "a10" {
        fmt.Println("Worked", s)
        return
    } else {
        fmt.Println(s)
    }
}