Cancellable returns an iterator over seq but it also checks if ctx is cancelled each n elements seq yields.

Cancellable2 returns an iterator over seq but it also checks if ctx is cancelled each n elements seq yields.

Clone maps seq by [slices.Clone].

Clone2 maps seq by [slices.Clone].

Collect maps seq by [slices.Collect].

Collect2 maps seq by [slices.Collect].

HandleErr returns an iterator over only former value of seq.

Sprintf maps seq by [fmt.Sprintf].

Sprintf2 maps seq by [fmt.Sprintf] format receives k as fist and v as second.