英文:
Global array in golang
问题
我正在尝试声明一个全局数组，然后稍后进行初始化，像这样：
package main
import (
"fmt"
)
var testStrings []string
func main() {
testStrings = [...]string{"apple","banana","kiwi"}
fmt.Println(testStrings)
}
但是我得到了错误提示："无法将 3string 字面量（类型为 3string）用作赋值中的 []string 类型"
如何声明全局数组而不指定大小？
英文:
I'm trying to declare a global array and then init it later like so:
package main
import (
"fmt"
)
var testStrings []string
func main() {
testStrings = [...]string{"apple","banana","kiwi"}
fmt.Println(testStrings)
}
But I'm getting error: "cannot use 3string literal (type 3string) as type []string in assignment"
How do I declare global array without specifying size?
答案1
得分: 10
[...] 表示一个数组。
[] 表示一个切片。
修改一个例子，例如：
package main
import (
"fmt"
)
var arrtestStrings [3]string
var slicetestStrings []string
func main() {
arrtestStrings = [...]string{"apple", "banana", "kiwi"}
slicetestStrings = []string{"apple", "banana", "kiwi"}
fmt.Println(arrtestStrings)
fmt.Println(slicetestStrings)
}
英文:
[...] means an array.
[] means a slice.
Change one. For example:
package main
import (
"fmt"
)
var arrtestStrings [3]string
var slicetestStrings []string
func main() {
arrtestStrings = [...]string{"apple", "banana", "kiwi"}
slicetestStrings = []string{"apple", "banana", "kiwi"}
fmt.Println(arrtestStrings)
fmt.Println(slicetestStrings)
}
答案2
得分: 7
根据Go规范：
> ... 表示数组长度等于最大元素索引加一。
这对你的代码不起作用，因为 testStrings 是一个slice，而不是一个array（请阅读有关数组和切片之间的区别的文章）。删除 ... 将修复你的程序：
testStrings = []string{"apple","banana","kiwi"}
英文:
From the Go specification:
> The notation ... specifies an array length equal to the maximum element index plus one.
This does not work for your code because testStrings is a slice, not an array (read about the difference between arrays and slices). Dropping the ... will fix your program:
testStrings = []string{"apple","banana","kiwi"}
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