[ruby-core:115525] [Ruby master Feature#20027] Range Deconstruction
Issue #20027 has been reported by stuyam (Stuart Yamartino). ---------------------------------------- Feature #20027: Range Deconstruction https://bugs.ruby-lang.org/issues/20027 * Author: stuyam (Stuart Yamartino) * Status: Open * Priority: Normal ---------------------------------------- Ranges are a powerful tool in ruby. A common range I use is a date range such as `(Date.yesterday..Date.tomorrow)`. A range will often be passed around to methods because the dates hold meaning together such as a timeframe for a table filter. Often I want to grab the original values out of a range like: ```ruby timeframe = (Date.yesterday..Date.tomorrow) start_date = timeframe.begin end_date = timeframe.end #=> start_date = yesterday #=> end_date = today ``` Similar to array and hash deconstruction I thought it would be useful to support range deconstruction like this: ```ruby start_date, end_date = (Date.yesterday..Date.tomorrow) #=> start_date = yesterday #=> end_date = today ``` This would also work for endless or beginless ranges since the beginning and end are just nil in those cases: ```ruby start_date, end_day = ..Date.tomorrow #=> start_date = nil #=> end_date = tomorrow ``` You could do this now using `to_a` like: ```ruby start_date, *middle_dates, end_date = (Date.new(2000,1,1)..Date.new(2023,1,1).to_a ``` However this has unnecessary performance issues by converting the range to an array especially if the range spans a large period, `middle_dates` would hold a very large array. Also if the range resulted in an array with 2 values, `end_date` would be nil and this wouldn't actually work to get the begin and end values. I think this provides a simple interface for a common pattern of deconstructing ranges into their beginning and end values. It would be useful for ranges regardless of date ranges or other types of ranges since they are essentially tuples. Would love to know what others think about this <3 -- https://bugs.ruby-lang.org/
Issue #20027 has been updated by stuyam (Stuart Yamartino). Subject changed from Range Deconstruction to Add Range Deconstruction Update title ---------------------------------------- Feature #20027: Add Range Deconstruction https://bugs.ruby-lang.org/issues/20027#change-105456 * Author: stuyam (Stuart Yamartino) * Status: Open * Priority: Normal ---------------------------------------- Ranges are a powerful tool in ruby. A common range I use is a date range such as `(Date.yesterday..Date.tomorrow)`. A range will often be passed around to methods because the dates hold meaning together such as a timeframe for a table filter. Often I want to grab the original values out of a range like: ```ruby timeframe = (Date.yesterday..Date.tomorrow) start_date = timeframe.begin end_date = timeframe.end #=> start_date = yesterday #=> end_date = today ``` Similar to array and hash deconstruction I thought it would be useful to support range deconstruction like this: ```ruby start_date, end_date = (Date.yesterday..Date.tomorrow) #=> start_date = yesterday #=> end_date = today ``` This would also work for endless or beginless ranges since the beginning and end are just nil in those cases: ```ruby start_date, end_day = ..Date.tomorrow #=> start_date = nil #=> end_date = tomorrow ``` You could do this now using `to_a` like: ```ruby start_date, *middle_dates, end_date = (Date.new(2000,1,1)..Date.new(2023,1,1).to_a ``` However this has unnecessary performance issues by converting the range to an array especially if the range spans a large period, `middle_dates` would hold a very large array. Also if the range resulted in an array with 2 values, `end_date` would be nil and this wouldn't actually work to get the begin and end values. I think this provides a simple interface for a common pattern of deconstructing ranges into their beginning and end values. It would be useful for ranges regardless of date ranges or other types of ranges since they are essentially tuples. Would love to know what others think about this <3 -- https://bugs.ruby-lang.org/
Issue #20027 has been updated by shan (Shannon Skipper). Pattern matching would be another option though Range doesn't implement #deconstruct or #deconstruct_keys by default. ``` ruby class Range def deconstruct = [self.begin, self.end] end 42..420 => low, high ``` Just an aside, but you could avoid the performance issues of splatting #to_a by using Range #begin and #end. ```ruby low, high = (42..420).then { [_1.begin, _1.end] } ``` ---------------------------------------- Feature #20027: Add Range Deconstruction https://bugs.ruby-lang.org/issues/20027#change-105528 * Author: stuyam (Stuart Yamartino) * Status: Open * Priority: Normal ---------------------------------------- Ranges are a powerful tool in ruby. A common range I use is a date range such as `(Date.yesterday..Date.tomorrow)`. A range will often be passed around to methods because the dates hold meaning together such as a timeframe for a table filter. Often I want to grab the original values out of a range like: ```ruby timeframe = (Date.yesterday..Date.tomorrow) start_date = timeframe.begin end_date = timeframe.end #=> start_date = yesterday #=> end_date = today ``` Similar to array and hash deconstruction I thought it would be useful to support range deconstruction like this: ```ruby start_date, end_date = (Date.yesterday..Date.tomorrow) #=> start_date = yesterday #=> end_date = today ``` This would also work for endless or beginless ranges since the beginning and end are just nil in those cases: ```ruby start_date, end_day = ..Date.tomorrow #=> start_date = nil #=> end_date = tomorrow ``` You could do this now using `to_a` like: ```ruby start_date, *middle_dates, end_date = (Date.new(2000,1,1)..Date.new(2023,1,1).to_a ``` However this has unnecessary performance issues by converting the range to an array especially if the range spans a large period, `middle_dates` would hold a very large array. Also if the range resulted in an array with 2 values, `end_date` would be nil and this wouldn't actually work to get the begin and end values. I think this provides a simple interface for a common pattern of deconstructing ranges into their beginning and end values. It would be useful for ranges regardless of date ranges or other types of ranges since they are essentially tuples. Would love to know what others think about this <3 -- https://bugs.ruby-lang.org/
Issue #20027 has been updated by mame (Yusuke Endoh). Status changed from Open to Rejected We discussed this at the dev meeting and decided to reject it. Currently, assignment deconstruction is available only for Arrays (note that assignment deconstruction is not pattern matching). Such special handling for Ranges is not justified by the expected frequency of use. This is my personal opinion, but it might be conceivable to introduce some method that returns `Range#begin` and `#end` as arrays. ```ruby p (1..100).begin_and_end #=> [1, 100] start_date, end_date = (Date.yesterday..Date.tomorrow).begin_and_end ``` ---------------------------------------- Feature #20027: Add Range Deconstruction https://bugs.ruby-lang.org/issues/20027#change-105782 * Author: stuyam (Stuart Yamartino) * Status: Rejected * Priority: Normal ---------------------------------------- Ranges are a powerful tool in ruby. A common range I use is a date range such as `(Date.yesterday..Date.tomorrow)`. A range will often be passed around to methods because the dates hold meaning together such as a timeframe for a table filter. Often I want to grab the original values out of a range like: ```ruby timeframe = (Date.yesterday..Date.tomorrow) start_date = timeframe.begin end_date = timeframe.end #=> start_date = yesterday #=> end_date = today ``` Similar to array and hash deconstruction I thought it would be useful to support range deconstruction like this: ```ruby start_date, end_date = (Date.yesterday..Date.tomorrow) #=> start_date = yesterday #=> end_date = today ``` This would also work for endless or beginless ranges since the beginning and end are just nil in those cases: ```ruby start_date, end_day = ..Date.tomorrow #=> start_date = nil #=> end_date = tomorrow ``` You could do this now using `to_a` like: ```ruby start_date, *middle_dates, end_date = (Date.new(2000,1,1)..Date.new(2023,1,1).to_a ``` However this has unnecessary performance issues by converting the range to an array especially if the range spans a large period, `middle_dates` would hold a very large array. Also if the range resulted in an array with 2 values, `end_date` would be nil and this wouldn't actually work to get the begin and end values. I think this provides a simple interface for a common pattern of deconstructing ranges into their beginning and end values. It would be useful for ranges regardless of date ranges or other types of ranges since they are essentially tuples. Would love to know what others think about this <3 -- https://bugs.ruby-lang.org/
Issue #20027 has been updated by stuyam (Stuart Yamartino). I like your suggestion of the `#begin_and_end` method, that solves the performance issues, it also then relies on solely array deconstruction doing it's own job which is nice! I could see `#begin_and_end` being useful for something like an ORM where you need the endpoints to do a `BETWEEN` in SQL or something and it would allow you to more easily deconstruct a range when a range is being used more as an object to store the endpoints rather than an object to ask questions about things in between the endpoints etc. ---------------------------------------- Feature #20027: Add Range Deconstruction https://bugs.ruby-lang.org/issues/20027#change-105799 * Author: stuyam (Stuart Yamartino) * Status: Rejected * Priority: Normal ---------------------------------------- Ranges are a powerful tool in ruby. A common range I use is a date range such as `(Date.yesterday..Date.tomorrow)`. A range will often be passed around to methods because the dates hold meaning together such as a timeframe for a table filter. Often I want to grab the original values out of a range like: ```ruby timeframe = (Date.yesterday..Date.tomorrow) start_date = timeframe.begin end_date = timeframe.end #=> start_date = yesterday #=> end_date = today ``` Similar to array and hash deconstruction I thought it would be useful to support range deconstruction like this: ```ruby start_date, end_date = (Date.yesterday..Date.tomorrow) #=> start_date = yesterday #=> end_date = today ``` This would also work for endless or beginless ranges since the beginning and end are just nil in those cases: ```ruby start_date, end_day = ..Date.tomorrow #=> start_date = nil #=> end_date = tomorrow ``` You could do this now using `to_a` like: ```ruby start_date, *middle_dates, end_date = (Date.new(2000,1,1)..Date.new(2023,1,1).to_a ``` However this has unnecessary performance issues by converting the range to an array especially if the range spans a large period, `middle_dates` would hold a very large array. Also if the range resulted in an array with 2 values, `end_date` would be nil and this wouldn't actually work to get the begin and end values. I think this provides a simple interface for a common pattern of deconstructing ranges into their beginning and end values. It would be useful for ranges regardless of date ranges or other types of ranges since they are essentially tuples. Would love to know what others think about this <3 -- https://bugs.ruby-lang.org/
Issue #20027 has been updated by Dan0042 (Daniel DeLorme). ```ruby (1..42).minmax #=> [1, 42] (42..1).minmax #=> [nil, nil] ``` ---------------------------------------- Feature #20027: Add Range Deconstruction https://bugs.ruby-lang.org/issues/20027#change-105801 * Author: stuyam (Stuart Yamartino) * Status: Rejected * Priority: Normal ---------------------------------------- Ranges are a powerful tool in ruby. A common range I use is a date range such as `(Date.yesterday..Date.tomorrow)`. A range will often be passed around to methods because the dates hold meaning together such as a timeframe for a table filter. Often I want to grab the original values out of a range like: ```ruby timeframe = (Date.yesterday..Date.tomorrow) start_date = timeframe.begin end_date = timeframe.end #=> start_date = yesterday #=> end_date = today ``` Similar to array and hash deconstruction I thought it would be useful to support range deconstruction like this: ```ruby start_date, end_date = (Date.yesterday..Date.tomorrow) #=> start_date = yesterday #=> end_date = today ``` This would also work for endless or beginless ranges since the beginning and end are just nil in those cases: ```ruby start_date, end_day = ..Date.tomorrow #=> start_date = nil #=> end_date = tomorrow ``` You could do this now using `to_a` like: ```ruby start_date, *middle_dates, end_date = (Date.new(2000,1,1)..Date.new(2023,1,1).to_a ``` However this has unnecessary performance issues by converting the range to an array especially if the range spans a large period, `middle_dates` would hold a very large array. Also if the range resulted in an array with 2 values, `end_date` would be nil and this wouldn't actually work to get the begin and end values. I think this provides a simple interface for a common pattern of deconstructing ranges into their beginning and end values. It would be useful for ranges regardless of date ranges or other types of ranges since they are essentially tuples. Would love to know what others think about this <3 -- https://bugs.ruby-lang.org/
Issue #20027 has been updated by stuyam (Stuart Yamartino). Yeah point Dan0042, `#minmax` _almost_ works, but as you point out it does not work because if the range is a reverse range you get `nil` for both values. Interesting! ` ```ruby (1..42).minmax #=> [1, 42] (42..1).minmax #=> [nil, nil] (1..42).then { [_1.begin, _1.end] } #=> [1, 42] (42..1).then { [_1.begin, _1.end] } #=> [42, 1] ``` ---------------------------------------- Feature #20027: Add Range Deconstruction https://bugs.ruby-lang.org/issues/20027#change-105821 * Author: stuyam (Stuart Yamartino) * Status: Rejected * Priority: Normal ---------------------------------------- Ranges are a powerful tool in ruby. A common range I use is a date range such as `(Date.yesterday..Date.tomorrow)`. A range will often be passed around to methods because the dates hold meaning together such as a timeframe for a table filter. Often I want to grab the original values out of a range like: ```ruby timeframe = (Date.yesterday..Date.tomorrow) start_date = timeframe.begin end_date = timeframe.end #=> start_date = yesterday #=> end_date = today ``` Similar to array and hash deconstruction I thought it would be useful to support range deconstruction like this: ```ruby start_date, end_date = (Date.yesterday..Date.tomorrow) #=> start_date = yesterday #=> end_date = today ``` This would also work for endless or beginless ranges since the beginning and end are just nil in those cases: ```ruby start_date, end_day = ..Date.tomorrow #=> start_date = nil #=> end_date = tomorrow ``` You could do this now using `to_a` like: ```ruby start_date, *middle_dates, end_date = (Date.new(2000,1,1)..Date.new(2023,1,1).to_a ``` However this has unnecessary performance issues by converting the range to an array especially if the range spans a large period, `middle_dates` would hold a very large array. Also if the range resulted in an array with 2 values, `end_date` would be nil and this wouldn't actually work to get the begin and end values. I think this provides a simple interface for a common pattern of deconstructing ranges into their beginning and end values. It would be useful for ranges regardless of date ranges or other types of ranges since they are essentially tuples. Would love to know what others think about this <3 -- https://bugs.ruby-lang.org/
Issue #20027 has been updated by stuyam (Stuart Yamartino). Conversation moved to new issue for implementation of `#begin_and_end` method on Range: #20080 ---------------------------------------- Feature #20027: Add Range Deconstruction https://bugs.ruby-lang.org/issues/20027#change-105822 * Author: stuyam (Stuart Yamartino) * Status: Rejected * Priority: Normal ---------------------------------------- Ranges are a powerful tool in ruby. A common range I use is a date range such as `(Date.yesterday..Date.tomorrow)`. A range will often be passed around to methods because the dates hold meaning together such as a timeframe for a table filter. Often I want to grab the original values out of a range like: ```ruby timeframe = (Date.yesterday..Date.tomorrow) start_date = timeframe.begin end_date = timeframe.end #=> start_date = yesterday #=> end_date = today ``` Similar to array and hash deconstruction I thought it would be useful to support range deconstruction like this: ```ruby start_date, end_date = (Date.yesterday..Date.tomorrow) #=> start_date = yesterday #=> end_date = today ``` This would also work for endless or beginless ranges since the beginning and end are just nil in those cases: ```ruby start_date, end_day = ..Date.tomorrow #=> start_date = nil #=> end_date = tomorrow ``` You could do this now using `to_a` like: ```ruby start_date, *middle_dates, end_date = (Date.new(2000,1,1)..Date.new(2023,1,1).to_a ``` However this has unnecessary performance issues by converting the range to an array especially if the range spans a large period, `middle_dates` would hold a very large array. Also if the range resulted in an array with 2 values, `end_date` would be nil and this wouldn't actually work to get the begin and end values. I think this provides a simple interface for a common pattern of deconstructing ranges into their beginning and end values. It would be useful for ranges regardless of date ranges or other types of ranges since they are essentially tuples. Would love to know what others think about this <3 -- https://bugs.ruby-lang.org/
participants (4)
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Dan0042 (Daniel DeLorme) -
mame (Yusuke Endoh)
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shan (Shannon Skipper)
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stuyam (Stuart Yamartino)