Go naming conventions for const

Question

The standard library uses camel-case, so I advise you do that as well. The first letter is uppercase or lowercase depending on whether you want to export the constant.

A few examples:

• md5.BlockSize
• os.O_RDONLY is an exception because it was borrowed directly from POSIX.
• os.PathSeparator

Go Code Review Comments

This page collects common comments made during reviews of Go code, so that a single detailed explanation can be referred to by shorthands. This is a laundry list of common mistakes, not a style guide.

You can view this as a supplement to http://golang.org/doc/effective_go.html.

Mixed Caps

See http://golang.org/doc/effective_go.html#mixed-caps. This applies even when it breaks conventions in other languages. For example an unexported constant is maxLength not MaxLength or MAX_LENGTH.

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Effective Go

MixedCaps

Finally, the convention in Go is to use MixedCaps or mixedCaps rather than underscores to write multiword names.

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The Go Programming Language Specification

Exported identifiers

An identifier may be exported to permit access to it from another package. An identifier is exported if both:

• the first character of the identifier's name is a Unicode upper case letter (Unicode class "Lu"); and

• the identifier is declared in the package block or it is a field name or method name.

All other identifiers are not exported.

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Use mixed caps.

Specific examples. Note that declaring the type in the constant (when relevant) can be helpful to the compiler.

// Only visible to the local file
const localFileConstant string = "Constant Value with limited scope"

// Exportable constant
const GlobalConstant string = "Everyone can use this"