[swift-evolution] [Accepted] SE-0133: Rename flatten() to joined()

[Chris Lattner]

> On Jul 27, 2016, at 4:00 PM, Jacob Bandes-Storch <jtbandes at gmail.com> wrote:
> 
> I figured that sentence was in reference to the methods currently named flatten().
> 
> The proposal also said that the String-based version of joined(separator:) (which are implemented separately) should have a default separator of "". There is currently no flatten() for collections of Strings.
> 
> https://github.com/apple/swift/blob/c6e828f761fc30f7ce444431de7da52814f96595/stdlib/public/core/String.swift#L769 <https://github.com/apple/swift/blob/c6e828f761fc30f7ce444431de7da52814f96595/stdlib/public/core/String.swift#L769>
> 
> I doubt there would be a performance difference between adding `func joined() { return joined(separator: "") }` and changing the parameter to `separator: String = "”`.

I’ll let a stdlib guru comment on this :-)

-Chris
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