Go language identifier and package name specification

The definition of identifier
identifier (identifier) A symbol used to identify an entity , It has different meanings in different application environments . In computer programming languages , Identifier is the name used by the user when programming , Used to give variables 、 Constant 、 function 、 Statement block and so on , To establish a relationship between the name and the use .
go Variables in language , function , And package name, etc. all belong to a kind of identifier .
Package naming rules
(1) As far as possible, the package name should be consistent with the directory name where it is located , Do not conflict with the standard library .
(2) with main The package of the function must put it package Defined as main, So that we can use go run To run the file ,go build To generate an executable file .
(3) Variable name 、 Function name 、 Constant names are named by hump method
(4) Variable name 、 Function name 、 Constant names are capitalized , Can be accessed by other packages . Lowercase letters can only be used in this package .
(5) Custom packages are referenced , It will be automatically replenished $GOPATH/src/ , The folder in the path is / Division .(GOPATH For environment variables , You have to configure it yourself ).