Grokking Advanced Go
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The iter Package

The package iter, added in Go 1.23, gives names to the two iterator forms that produce values. It defines a sequence of single values and a sequence of pairs, and each definition is one line of code.

type (
	Seq[V any]     func(yield func(V) bool)
	Seq2[K, V any] func(yield func(K, V) bool)
)

These types add no behavior to a function. They give every iterator of the same form one shared name, so signatures in different packages can state the same type.

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