Go Declarations

Go Declarations and Initialization

Compatibility: Examples may use any, which requires Go 1.18+.

Resource Routing

• references/SCOPE.md - Read when deciding between var, :=, if-init, and narrow variable scope.
• references/IOTA.md - Read when designing constants or enum-like values.
• references/INITIALIZATION.md - Read when initializing structs, maps, zero values, or pointers.
• references/LITERALS.md - Read for composite literal formatting and keyed-field tradeoffs.
• references/STRUCTS.md - Read when designing or initializing structs.
• references/SHADOWING.md - Read when a declaration may shadow a builtin or outer variable.

Quick Reference: var vs :=

Context	Use	Example
Top-level	var (always)	var _s = F()
Local with value	:=	s := "foo"
Local zero-value (intentional)	var	var filtered []int
Type differs from expression	var with type	var _e error = F()

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Group Similar Declarations

Group related var, const, type in parenthesized blocks. Separate unrelated declarations into distinct blocks.

// Bad
const a = 1
const b = 2