Golang Init Function

When is the init function called?

• After all the variable declarations in the package have evaluated their initializers.
• Only after all the imported packages have been initialized.

Order of package initialization

1. initialization of imported packages (recursive definition)
2. computing and assigning initial values for variables declared in a package block
3. executing init functions inside the package

Usecase of init function

• The initializations can not be expressed as declarations.
• Verify or repair correctness of the program state before real execution begins.

Other tips about the init function

• Many init functions can be defined in the same package or file

Reference

• Init functions in go (recommend to read)
• The init function – golang doc
• When is the init function run – stackoverflow