Enum case count

Joao_Nunes · February 18, 2016, 5:57pm

Hi,

I have one proposal for the language to add a property to enums with the total number of cases.

Example:

enum Section {
case Tag
case Article
}

let cases = Section.caseCount

This would be extremely useful when using enums for tableviews.

What do you think?

João Nunes

···

Sent from my iPhone

jtbandes · February 18, 2016, 6:58pm

The pull request is waiting to be merged.

···

On Thu, Feb 18, 2016 at 10:08 AM, Ross O'Brien via swift-evolution < swift-evolution@swift.org> wrote:

João,

your proposal has been proposed before, but I don't think it's been
formally submitted for review yet:

https://github.com/jtbandes/swift-evolution/blob/977a9923fd551491623b6bfd398d5859488fe1ae/proposals/0000-derived-collection-of-enum-cases.md

On Thu, Feb 18, 2016 at 5:57 PM, João Nunes <swift-evolution@swift.org> > wrote:

Hi,

I have one proposal for the language to add a property to enums with the
total number of cases.

Example:

enum Section {
case Tag
case Article
}

let cases = Section.caseCount

This would be extremely useful when using enums for tableviews.

What do you think?

João Nunes

Sent from my iPhone
_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org
https://lists.swift.org/mailman/listinfo/swift-evolution

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swift-evolution@swift.org
https://lists.swift.org/mailman/listinfo/swift-evolution

Erica_Sadun · February 18, 2016, 6:22pm

I'd really like to see the count / collection thing happen.

-- E

···

On Feb 18, 2016, at 11:08 AM, Ross O'Brien via swift-evolution <swift-evolution@swift.org> wrote:

João,

your proposal has been proposed before, but I don't think it's been formally submitted for review yet:
https://github.com/jtbandes/swift-evolution/blob/977a9923fd551491623b6bfd398d5859488fe1ae/proposals/0000-derived-collection-of-enum-cases.md

On Thu, Feb 18, 2016 at 5:57 PM, João Nunes <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:
Hi,

I have one proposal for the language to add a property to enums with the total number of cases.

Example:

enum Section {
case Tag
case Article
}

let cases = Section.caseCount

This would be extremely useful when using enums for tableviews.

What do you think?

João Nunes

Sent from my iPhone
_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org <mailto: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

Ross_O_Brien · February 18, 2016, 6:08pm

João,

your proposal has been proposed before, but I don't think it's been
formally submitted for review yet:

github.com

jtbandes/swift-evolution/blob/977a9923fd551491623b6bfd398d5859488fe1ae/proposals/0000-derived-collection-of-enum-cases.md

# Derived Collection of Enum Cases

* Proposal: [SE-NNNN](https://github.com/apple/swift-evolution/blob/master/proposals/NNNN-derived-collection-of-enum-cases.md)
* Author(s): [Jacob Bandes-Storch](https://github.com/jtbandes)
* Status: **Awaiting review**
* Review manager: TBD

## Introduction

It is a truth universally acknowledged, that a programmer in possession of an enum with many cases, must eventually be in want of dynamic enumeration over them.

This topic has come up three times on the swift-evolution mailing list so far:

- [List of all Enum values (for simple enums)](https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001233.html) (December 8, 2015)
- [Proposal: Enum 'count' functionality](https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151221/003819.html) (December 21, 2015)
- [Draft Proposal: count property for enum types](https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160111/006853.html) (January 17, 2016)

Enumerating enumerations in Swift is also a popular topic on Stack Overflow:

- [How to enumerate an enum with String type?](http://stackoverflow.com/questions/24007461/how-to-enumerate-an-enum-with-string-type) (June 3, 2014; question score 131)

This file has been truncated. show original

···

On Thu, Feb 18, 2016 at 5:57 PM, João Nunes <swift-evolution@swift.org> wrote:

Hi,

I have one proposal for the language to add a property to enums with the
total number of cases.

Example:

enum Section {
case Tag
case Article
}

let cases = Section.caseCount

This would be extremely useful when using enums for tableviews.

What do you think?

João Nunes

Sent from my iPhone
_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org
https://lists.swift.org/mailman/listinfo/swift-evolution

Joao_Nunes · February 18, 2016, 6:15pm

Thanks Ross.

In that case ignore my email.

João Nunes

···

On 18 Feb 2016, at 20:08, Ross O'Brien <narrativium+swift@gmail.com> wrote:

João,

your proposal has been proposed before, but I don't think it's been formally submitted for review yet:
https://github.com/jtbandes/swift-evolution/blob/977a9923fd551491623b6bfd398d5859488fe1ae/proposals/0000-derived-collection-of-enum-cases.md

On Thu, Feb 18, 2016 at 5:57 PM, João Nunes <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:
Hi,

I have one proposal for the language to add a property to enums with the total number of cases.

Example:

enum Section {
case Tag
case Article
}

let cases = Section.caseCount

This would be extremely useful when using enums for tableviews.

What do you think?

João Nunes

Sent from my iPhone
_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org <mailto:swift-evolution@swift.org>
https://lists.swift.org/mailman/listinfo/swift-evolution

Joao_Nunes · February 18, 2016, 6:33pm

Richard,

Why not the following?

enum Foo {
case Bar(String)
case Baz(Int)
}

let cases: [String: Any] = Foo.allCases
print(cases)
// [.Bar(String), .Baz(Int)]

João Nunes

···

On 18 Feb 2016, at 20:22, Erica Sadun <erica@ericasadun.com> wrote:

I'd really like to see the count / collection thing happen.

-- E

On Feb 18, 2016, at 11:08 AM, Ross O'Brien via swift-evolution <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:

João,

your proposal has been proposed before, but I don't think it's been formally submitted for review yet:
https://github.com/jtbandes/swift-evolution/blob/977a9923fd551491623b6bfd398d5859488fe1ae/proposals/0000-derived-collection-of-enum-cases.md

On Thu, Feb 18, 2016 at 5:57 PM, João Nunes <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:
Hi,

I have one proposal for the language to add a property to enums with the total number of cases.

Example:

enum Section {
case Tag
case Article
}

let cases = Section.caseCount

This would be extremely useful when using enums for tableviews.

What do you think?

João Nunes

Sent from my iPhone
_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org <mailto:swift-evolution@swift.org>
https://lists.swift.org/mailman/listinfo/swift-evolution

_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org <mailto:swift-evolution@swift.org>
https://lists.swift.org/mailman/listinfo/swift-evolution

Richardjrossiii · February 18, 2016, 6:37pm

Because returning a usable function reference is more useful than just a string describing the argument types, at least for most common use cases.

···

--
Richard

On Feb 18, 2016, at 10:33 AM, Joao Nunes via swift-evolution <swift-evolution@swift.org> wrote:

Richard,

Why not the following?

enum Foo {
case Bar(String)
case Baz(Int)
}

let cases: [String: Any] = Foo.allCases
print(cases)
// [.Bar(String), .Baz(Int)]

João Nunes

On 18 Feb 2016, at 20:22, Erica Sadun <erica@ericasadun.com> wrote:

I'd really like to see the count / collection thing happen.

-- E

On Feb 18, 2016, at 11:08 AM, Ross O'Brien via swift-evolution <swift-evolution@swift.org> wrote:

João,

your proposal has been proposed before, but I don't think it's been formally submitted for review yet:
https://github.com/jtbandes/swift-evolution/blob/977a9923fd551491623b6bfd398d5859488fe1ae/proposals/0000-derived-collection-of-enum-cases.md

On Thu, Feb 18, 2016 at 5:57 PM, João Nunes <swift-evolution@swift.org> wrote:
Hi,

I have one proposal for the language to add a property to enums with the total number of cases.

Example:

enum Section {
case Tag
case Article
}

let cases = Section.caseCount

This would be extremely useful when using enums for tableviews.

What do you think?

João Nunes

Sent from my iPhone
_______________________________________________
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

_______________________________________________
swift-evolution mailing list
swift-evolution@swift.org
https://lists.swift.org/mailman/listinfo/swift-evolution