iterutil

func Enumerate ¶ added in v0.25.2

func Enumerate[E any](seq iter.Seq[E]) iter.Seq2[int, E]

Enumerate takes an iter.Seq and returns an iter.Seq2 where the first value is an int counter.

func Keys ¶ added in v0.25.2

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

Keys takes an iter.Seq2 and returns an iter.Seq that iterates over the first value in each pair of values.

func Map ¶

func Map(err error) error

Map the nil if it is StopIteration, or keep the error otherwise

func MinFunc ¶ added in v0.25.2

func MinFunc[E any](seq iter.Seq[E], cmp func(E, E) int) E

MinFunc returns the minimum element in seq, using cmp to compare elements. If seq has no values, the zero value is returned.

func StopIteration ¶

func StopIteration() error

StopIteration returns a sentinel error that indicates stopping the iteration.

This error should not be propagated further, i.e., if a closure returns this error, the loop should break returning nil error. For example:

f := func(i int) error {
	if i == 10 {
		return iterutil.StopIteration()
	}
	return nil
}

for i := range slice {
	if err := f(i); err != nil {
		return iterutil.Map(err)
	}
	// continue when nil error
}