英文:
golang i use fmt.Println() after println() but
问题
这是我的代码（使用Golang编写）：
func main() {
names := []string{"1", "2", "3"}
for index, name := range names {
println(index, name)
}
myMap := map[string]string{
"A": "Apple",
"B": "Banana",
"C": "Charlie",
}
for key, val := range myMap {
fmt.Println(key, val)
}
}
这是结果：
0 1
B Banana
1 2
2 3
C Charlie
A Apple
- 为什么
names和myMap的顺序混合在一起了？ - 为什么
myMap的顺序不同？
英文:
this is my code(golang)
func main() {
names := []string{"1", "2", "3"}
for index, name := range names {
println(index, name)
}
myMap := map[string]string{
"A": "Apple",
"B": "Banana",
"C": "Charlie",
}
for key, val := range myMap {
fmt.Println(key, val)
}
}
and this is result
0 1
B Banana
1 2
2 3
C Charlie
A Apple
- Why was it names and myMap mixed?
- Why different order of myMap?
答案1
得分: 9
> func println(args ...Type)
> println内置函数以特定于实现的方式格式化其参数，并将结果写入标准错误。
> func Println(a ...interface{}) (n int, err error)
> fmt.Println使用其操作数的默认格式进行格式化，并写入标准输出。
fmt.Println写入标准输出（stdout），println写入标准错误（stderr），这是两个不同的、不同步的文件。
> map是一组无序的元素，元素类型称为元素类型，由另一种类型的一组唯一键（称为键类型）索引。
> "for"语句指定了一个块的重复执行。
> map的迭代顺序未指定，并且不能保证与下一次迭代相同。
map的元素是无序的。迭代顺序未指定。
英文:
> func println
>
> func println(args ...Type)
>
> The println built-in function formats its arguments in an
> implementation-specific way and writes the result to standard error.
>
> func Println
>
> func Println(a ...interface{}) (n int, err error)
>
> fmt.Println formats using the default formats for its operands and
> writes to standard output.
fmt.Println writes to standard output (stdout) and println writes to standard error (stderr), two different, unsynchronized files.
> Map types
>
> A map is an unordered group of elements of one type, called the
> element type, indexed by a set of unique keys of another type, called
> the key type.
>
> For statements
>
> A "for" statement specifies repeated execution of a block.
>
> The iteration order over maps is not specified and is not guaranteed
> to be the same from one iteration to the next.
Maps elements are unordered. The iteration order is not specified.
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