What is the meaning of identifiers in go language

In the Go language, identifiers refer to the character sequences used by the Go language to name various variables, methods, functions, etc.; identifiers consist of several letters, underscores "_", and numbers, and The first character must be a letter. In layman's terms, any name that can be defined by yourself can be called an identifier. An identifier must be declared before using it. To declare an identifier is to bind the identifier to a constant, type, variable, function or code package; the name of the identifier cannot be repeated in the same code block.

The operating environment of this tutorial: Windows 7 system, GO version 1.18, Dell G3 computer.

What is an identifier in the Go language?

The character sequence used by Golang to name various variables, methods, functions, etc. is called an identifier. symbol.

Identifiers refer to the character sequences used by the Go language to name various variables, methods, functions, etc. The identifier consists of several letters, underscore_, and numbers, and the first character must be a letter.

In layman's terms, anywhere you can give a name is called an identifier. Any place you can give a name is called an identifier. To simply understand, an identifier is a name, and its main function is to serve as a name. The names of variables, functions, classes, modules, and other objects.

An identifier must be declared before using it. To declare an identifier is to bind the identifier to a constant, type, variable, function or code package. The name of an identifier cannot be repeated within the same code block.

Naming rules for Go language identifiers

• Go language identifiers consist of 26 English letters, uppercase and lowercase, 0-9, _.

• Go language identifiers cannot start with a number.

• Go language identifiers are strictly case-sensitive.

• Go language identifiers cannot contain special characters such as spaces, @, %, and $.

• The underscore _ itself is a special identifier in Go, called the empty identifier. Can represent any other identifier, but its corresponding value will be ignored (for example: a return value is ignored). So it can only be used as a placeholder, not an identifier.

• Cannot use system reserved keywords as identifiers (25 in total).

You also need to pay attention to the following points when naming identifiers:

• The naming of identifiers should be as short and meaningful as possible;

• cannot be repeated with the package name in the standard library;

• Use camel case naming method when naming variables, functions, and constants, such as stuName, getVal;

Of course, the first letter of the names of variables, functions, and constants in the Go language can also be capitalized. If the first letter is capitalized, it means that it can be accessed by other packages (similar to public in Java ); if the first letter is lowercase, it means it can only be used in this package (similar to private in Java).

【Related recommendations: Go video tutorial, Programming teaching】

The above is the detailed content of What is the meaning of identifiers in go language. For more information, please follow other related articles on the PHP Chinese website!