From: sergey.gnuskov@... Date: 2020-12-21T08:19:45+00:00 Subject: [ruby-core:101572] [Ruby master Bug#17409] Endless range of dates stuck on include? when miss Issue #17409 has been updated by gsmetal (Sergey G). duerst (Martin D�rst) wrote in #note-4: > zverok (Victor Shepelev) wrote in #note-1: > > Nothing specific to dates there, and not a bug. > > > > This is just how ranges work: > > * `range.include?(x)` is basically `range.each.any? {|el| el == x }`, which, with endless range, is an infinite loop > > * `range.cover?(x)` is basically `x >= range.begin && x <= range.end`, which is instantaneous. > > > > The behavior of `#include?` is redefined for Numeric and String, so `(1..).include?(0)` will behave like `cover?` (return `false` immediately), but with any other type, the behavior is the same as for Date. > > What's the reason there is no redefinition for Date? Is there an actual use case for something like the current `(Date.today..).include?(Date.today - 1)` (of course with other actual values, because we don't need this to create an infinite loop)? Yes, it was a little bit frustrating, that everything worked on numbers and then it unexpectedly stuck on dates.. This case with endless ranges should be at least somehow mentioned in `include?` documentation, I think. Now it doesn't seem very clear [here](https://ruby-doc.org/core-2.7.1/Range.html#method-i-include-3F). ---------------------------------------- Bug #17409: Endless range of dates stuck on include? when miss https://bugs.ruby-lang.org/issues/17409#change-89357 * Author: gsmetal (Sergey G) * Status: Rejected * Priority: Normal * ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN ---------------------------------------- This code stucks (on latest ruby 2.7.1): ```ruby require 'date' (Date.today..).include?(Date.today - 1) ``` But it works well with `cover?`: ```ruby 2.7.1 :001 > require 'date' => true 2.7.1 :002 > (Date.today..).cover?(Date.today - 1) => false ``` -- https://bugs.ruby-lang.org/ Unsubscribe: