Makes sense. Thanks for the explanation. 

--Karim

> On Mar 30, 2017, at 7:43 PM, Ben Cohen <[email protected]> wrote:
> 
> 
>> On Mar 30, 2017, at 10:05 AM, Karim Nassar via swift-evolution 
>> <[email protected]> wrote:
>> 
>> 
>>> Message: 12
>>> Date: Thu, 30 Mar 2017 12:23:13 +0200
>>> From: Adrian Zubarev <[email protected]>
>>> To: Ben Cohen <[email protected]>
>>> Cc: [email protected]
>>> Subject: Re: [swift-evolution] [Pitch] String revision proposal #1
>>> Message-ID: <[email protected]>
>>> Content-Type: text/plain; charset="utf-8"
>>> 
>>> I haven’t followed the topic and while reading the proposal I found it a 
>>> little confusing that we have inconsistent type names. I’m not a native 
>>> English speaker so that’s might be the main case for my confusion here, so 
>>> I’d appreciate for any clarification. ;-)
>>> 
>>> SubSequence vs. Substring and not SubString.
>>> 
>>> The word substring is an English word, but so is subsequence (I double 
>>> checked here).
>>> 
>>> So where exactly is the issue here? Is it SubSequence which is written in 
>>> camel case or is it Substring which is not?
>>> 
>>> 
>>> 
>>> -- 
>>> Adrian Zubarev
>>> Sent with Airmail
>> 
>> 
>> I’d also be curious if StringSlice was considered, since we have already the 
>> well-established and seemingly-parallel ArraySlice.
>> 
> 
> Yup we considered it (I should probably have put it in the Alternatives 
> Considered section). Also considered: having nothing but String.SubSequence. 
> In fact it may be Substring is just a typealias for String.SubSequence, 
> though this would be an implementation detail rather than part of the 
> proposal.
> 
> The current hope (unrelated to String) is that ArraySlice could be 
> eliminated, by introducing some kind of “ContiguouslyStored” protocol and 
> then extending the general Slice when it slices something that conforms to 
> that. But this can’t be done with Substring because of the small string 
> optimization.
> 
> The other difference is there’s no common term of art for a slice of an 
> Array, whereas there is for a slice of a String.
> 
>> —Karim
>> 
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> 

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