Go Wiki: Iota
Summary
Go’siota identifier is used inconst declarations to simplify definitions of incrementing numbers. Because it can be used in expressions, it provides a generality beyond that of simple enumerations.
The value of iota is reset to 0 whenever the reserved wordconst appears in the source (i.e. each const block) and incremented by one after eachConstSpec e.g. each Line. This can be combined with the constant shorthand (leaving out everything after the constant name) to very concisely define related constants.
Iota:https://go.dev/ref/spec#Iota
Constant declarations:https://go.dev/ref/spec#Constant_declarations
Examples
The official spec has two great examples:
Here’s one from Effective Go:
type ByteSize float64const ( _ = iota // ignore first value by assigning to blank identifier KB ByteSize = 1 << (10 * iota) MB GB TB PB EB ZB YB)Weekday enum example - How iota is calculated - FromLearn Go Programming Blog:
Articles
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