For collections, I think we should call returning a random element -randomElement, and choosing a random element without replacement -popRandomElement
var list = [1,2,3,4] let a:Int? = list.randomElement //List is still [1,2,3,4] and ‘a’ contains one of the elements let b:Int? = list.popRandomElement //Now list contains all the elements except the one in ‘b’ Thanks, Jon > On Nov 30, 2017, at 10:15 AM, Xiaodi Wu via swift-evolution > <swift-evolution@swift.org> wrote: > > Right—again, this is yet another difference between two things both named > “random” in this proposal. Almost always, when we say “give me two random > integers,” we want independent random samples from the set of all integers. > But for collections, a very common (and probably more common operation) is to > _sample without replacement_. Conflating the two is how hard-to-detect errors > arise. > > On Thu, Nov 30, 2017 at 10:29 Martin Waitz via swift-evolution > <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote: > Hi Erica, > > > Doesn't `choose` usually take two arguments, the `count` to choose > > (presumably defaulting to 1) and the collection to choose `from`? > > This might be useful for collections, when you want to draw several elements > without drawing the same element twice. > For ranges of random numbers you usually need independent numbers and just > call the generator multiple times. > Both use cases could be provided as overloads (a default argument would > require that the return value has the same type, which would be unfortunate > here). > > -- > Martin > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org <mailto:swift-evolution@swift.org> > https://lists.swift.org/mailman/listinfo/swift-evolution > <https://lists.swift.org/mailman/listinfo/swift-evolution> > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution
_______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution
