itertools

func Attach[K, V any](seq iter.Seq[K], v V) iter.Seq2[K, V]

func Cat[T any](seqs ...iter.Seq[T]) iter.Seq[T]

func Cat2[K, V any](seqs ...iter.Seq2[K, V]) iter.Seq2[K, V]

func Filter[T any](seq iter.Seq[T], pred func(T) bool) iter.Seq[T]

func Filter2[K, V any](seq iter.Seq2[K, V], pred func(K, V) bool) iter.Seq2[K, V]

func First[K, V any](seq iter.Seq2[K, V]) iter.Seq[K]

func Map[Vin, Vout any](seq iter.Seq[Vin], transform func(Vin) Vout) iter.Seq[Vout]

func Map2[Kin, Vin, Kout, Vout any](seq iter.Seq2[Kin, Vin], transform func(Kin, Vin) (Kout, Vout)) iter.Seq2[Kout, Vout]

func Map12[Vin, Kout, Vout any](seq iter.Seq[Vin], transform func(Vin) (Kout, Vout)) iter.Seq2[Kout, Vout]

func Map21[Kin, Vin, Vout any](seq iter.Seq2[Kin, Vin], transform func(Kin, Vin) Vout) iter.Seq[Vout]

func Range[Int constraints.Unsigned](start, end Int) iter.Seq[Int]

func Stringify[V fmt.Stringer](seq iter.Seq[V]) iter.Seq[string]

func Swap[K, V any](seq iter.Seq2[K, V]) iter.Seq2[V, K]