iterator

func Filter[V any](it iter.Seq[V], cond func(V) bool) iter.Seq[V]

func Filter2[K, V any](it iter.Seq2[K, V], cond func(K, V) bool) iter.Seq2[K, V]

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

func ForEach[V any](it iter.Seq[V], fn func(V))

func ForEach2[K, V any](it iter.Seq2[K, V], fn func(K, V))

func Map[V1, V2 any](it iter.Seq[V1], mapper func(V1) V2) iter.Seq[V2]

func Map2[K1, V1, K2, V2 any](it iter.Seq2[K1, V1], mapper func(K1, V1) (K2, V2)) iter.Seq2[K2, V2]

func Second[K, V any](it iter.Seq2[K, V]) iter.Seq[V]