[ruby-core:100907] [Ruby master Feature#17312] New methods in Enumerable and Enumerator::Lazy: flatten, product, compact

Issue #17312 has been updated by zverok (Victor Shepelev).


@mame @Dan0042 Oh, you are right, starting to think from `Enumerable::Lazy` perspective I've missed a huge incompatibility introduced by `flatten`.

@mame I'll split into several proposals+patches: `Enumerable#compact`, and, I am starting to think now, maybe `Enumerator#flatten` would make some sense. As for `#product`, I just added it for completeness (as a method which also can work with unidirectional enumeration), I can't from the top of my head remember if I needed it some time in the past.

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Feature #17312: New methods in Enumerable and Enumerator::Lazy: flatten, product, compact
https://bugs.ruby-lang.org/issues/17312#change-88559

* Author: zverok (Victor Shepelev)
* Status: Open
* Priority: Normal
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(The offspring of #16987, which was too vague/philosophical)

I propose to add to `Enumerable` and `Enumerator::Lazy` the following methods:
* `compact`
* `product`
* `flatten`

All of them can be performed with a one-way enumerator. All of them make sense for situations other than "just an array". All of them can be used for processing large sequences, and therefore meaningful to add to `Lazy`.



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