Go 语言中的标识符
原文:https://www.geeksforgeeks.org/identifiers-in-go-language/
在编程语言中，标识符用于识别目的。或者换句话说，标识符是程序组件的用户定义名称。在 Go 语言中，标识符可以是变量名、函数名、常量、语句标签、包名或类型。
例:
package main
import "fmt"
func main() {
var name = "GeeksforGeeks"
}
在上例中，共有三个标识符可用:
- Master: Name of the package.
- Main: The name of the function.
- Name: The name of the variable
定义标识符的规则:定义有效 Go 标识符有一定的有效规则。这些规则应该被遵守，否则，我们会得到一个编译时错误。
- The name of the identifier must begin with a letter or an underscore (). And the name may contain letters "a-z" or "A-Z" or numbers 0-9 and the character "".
- The name of the identifier cannot start with a number.
- The name of the identifier is case sensitive.
- Keyword is not allowed as identifier name.
- The length of the identifier is not limited, but it is recommended to use only the optimal length of 4–15 letters.
例:
// Valid identifiers:
_geeks23
geeks
gek23sd
Geeks
geeKs
geeks_geeks
// Invalid identifiers:
212geeks
if
default
注意:
-
In Go language, there are some pre-declared identifiers that can be used for constants, types and functions. These names are not reserved; you can use them in the declaration. The following is a list of pre-declared identifiers:
```go For Constants: true, false, iota, nil
For Types: int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, uintptr, float32, float64, complex128, complex64, bool, byte, rune, string, error
For Functions: make, len, cap, new, append, copy, close, delete, complex, real, imag, panic, recover
```
-
The identifier represented by the underscore character (_) is called a blank identifier. It is used as an anonymous placeholder, not a regular identifier, and has a special meaning in declaration, operand and assignment.
- An identifier that is allowed to access it from another package is called a derived identifier. The exported identifiers are those that meet the following conditions:
- The first character of the exported identifier name should be Unicode capital letter.
- Identifiers should be declared in package blocks, either variable names or method names.
- The uniqueness of the identifier means that it is unique with other sets of identifiers available in your program or package, and they will not be exported.
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