[swift-evolution] [Pitch] Add an all algorithm to Sequence

[Ricardo Parada]

Hi all,

I think that when used without the argument label it is not as clear what it does.  For example:

nums.all { $0 % 2 == 0 }

can be interpreted as give me all the even elements.

So if the argument label were to be left out, then I would rename it.  Some options:

nums.allSatisfy { $0 % 2 == 0 }		// All are even
nums.allMatch { $0 % 2 == 0 }		// All are even
nums.membersSatisfy { $0 % 2 == 0 }	// All are even
nums.membersMatch { $0 % 2 == 0 }	// All are even
nums.elementsSatisfy { $0 % 2 == 0 }	// All are even
nums.elementsMatch { $0 % 2 == 0 }	// All are even

Personally, I think I like   nums.allMatch { $0 % 2 == 0 }. 



> On Apr 1, 2017, at 1:58 PM, Nevin Brackett-Rozinsky via swift-evolution <swift-evolution at swift.org> wrote:
> 
> If indeed “all(equal:)” is rarely needed, then perhaps it is best to leave it out *and also* leave out the argument label from “all(matching:)”. Then the signature would be similar to,
> 
> func all(_ predicate: (Element)->Bool) -> Bool
> 
> and the points-of-use would look like:
> 
> nums.all( isEven )
> nums.all{ $0 == 9 }
> nums.all{ n in n*n < 2 }
> 
> Nevin
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