Order of cases in an enum that conforms to CaseIterable protocol in Swift?

Question

Is the order of cases in an enum that conforms to CaseIterable protocol guaranteed to be the order in which it was declared ?

enum MyEnum: CaseIterable {
    case test
    case foo
    case bar
    case play
}

print(MyEnum.allCases)

will print:

[MyEnum.test, MyEnum.foo, MyEnum.bar, MyEnum.play]

I want to know if this order is guaranteed.

From this blog we can see that the way swift compiler parses, the order is guaranteed. But I could not find any documentation that this behaviour is guaranteed and not subject to change.

P.S. This is not a case of XYZ problem. I just want to know about this particular behaviour in Swift.

Adrian · Accepted Answer · 2019-08-01 05:06:52Z

27

Yes, according to the documentation.

The synthesized allCases collection provides the cases in order of their declaration.

answered Aug 1, 2019 at 5:06

Adrian

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May Rest in Peace Over a year ago

Ohh. I don't know how I missed it. Thanks.

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