From: "trans (Thomas Sawyer)" <transfire@...>
Date: 2012-03-26T23:28:18+09:00
Subject: [ruby-core:43686] [ruby-trunk - Feature #6166] Enumerator::Lazy#pinch


Issue #6166 has been updated by trans (Thomas Sawyer).


I like having a method myself b/c it reads better. I think "pinch" conveys the sort of "closing action" of the de-lazying.

Of course, #fetch would work as well, and that's a standard method, but it's interface only accepts an index, not a range, so it's too limited as is.

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Feature #6166: Enumerator::Lazy#pinch
https://bugs.ruby-lang.org/issues/6166#change-25182

Author: trans (Thomas Sawyer)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 


In previous issue #6158 it has been determined that Enumerator::Lazy#take should be lazy. But an eager form of #take would still be useful.

To this end I'll suggest `Enumerator::Lazy#pinch`. Examples of usage:

    e.lazy.pinch 1

    e.lazy.pinch 1..2

    e.lazy.pinch 1,2

It is basically equivalent to calling `to_a[index]`, but has the advantage of being a single invocation instead of two, and reads better.

The #pinch method would be strictly a Lazy method and have no counterpart in Enumerable.



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