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Missing unique() method on Iterable #8017

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sethladd opened this issue Jan 22, 2013 · 1 comment
Closed

Missing unique() method on Iterable #8017

sethladd opened this issue Jan 22, 2013 · 1 comment
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area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. closed-obsolete Closed as the reported issue is no longer relevant core-n P2 A bug or feature request we're likely to work on type-enhancement A request for a change that isn't a bug

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@sethladd
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I went looking for .unique() on iterable and I didn't find it. I have a list that I've mapped and I'd like to get the unique items.

I could create a Set and add all the items in there, but it's nice to be able to chain up these transforms:

collection.mappedBy().unique()

What is the canonical way to get a unique set of items from an iterable? I suppose I could write a reduce() to do it, but would like to see unique() :)
@DartBot
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DartBot commented Jan 23, 2013

This comment was originally written by @seaneagan

Hmmm, there is a toSet() already, but it's not lazy. Maybe replace toSet()/toList() with asSet()/asList() and then add a cache() method:

coll.mappedBy(f).asSet().cache();
coll.mappedBy(f).asList().cache();
coll.mappedBy(f).cache(); // if you don't care about the return type

@sethladd sethladd added Type-Enhancement area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. labels Jan 23, 2013
@kevmoo kevmoo added P2 A bug or feature request we're likely to work on type-enhancement A request for a change that isn't a bug and removed triaged labels Feb 29, 2016
@lrhn lrhn mentioned this issue Aug 11, 2017
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@lrhn lrhn added the core-m label Aug 11, 2017
@floitschG floitschG added core-n and removed core-m labels Aug 29, 2017
@matanlurey matanlurey added the closed-obsolete Closed as the reported issue is no longer relevant label Jun 19, 2018
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area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. closed-obsolete Closed as the reported issue is no longer relevant core-n P2 A bug or feature request we're likely to work on type-enhancement A request for a change that isn't a bug
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