How Does Lexical File Name Order Affect Package Initialization in Go?

Lexical File Name Order in Go

In the Go specification's package initialization section, "lexical file name order" refers to the predetermined arrangement of source files belonging to a single package.

Definition of Lexical Order

Lexical order is a method of comparison used for strings, where the order is determined by the character codes of each character. The order of English alphabet character codes follows the natural order of letters. For file names, this means they are compared character by character, with non-letters (digits, dashes, etc.) being accounted for according to their character code value.

Significance in Go

The Go specification encourages build systems to present multiple files from the same package in lexical file name order. This convention helps ensure consistency in initialization behavior during compilation.

Purpose and Implications

By adhering to lexical file name order, you can rely on the same order of source file processing and execution of the package's init() functions during compilation. This is particularly useful when the order of init() function execution matters within the package.

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