indexOf bug? about exswift HOT 5 CLOSED

indexOf returns nil if the element is not found or not compatible with the Array.Element type.
3 should be 3.0. This is to ensure the elements in the array implement Equatable.

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indexOf uses find function which returns Optional(1), so now there is some inconsistency

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@mijn-design We're talking about the indexOf method in ExSwift.
@nstepan What I'm trying to explain is that you can't use find on the Array unless Array.Element is Equatable, when you extend the Array class, you're extending every possible Array so you don't know if Array.Element is Equatable (and you can't extend only Equatable arrays).
To only way to search for an element despite this problem is casting the array elements to an Equatable type, the first parameter you pass. This is what (unsafeBitCast(self, [U].self) does in indexOf.
Doing this, only allows you to cast to the elements' real type (e.g. if you pass Int, casting an array of Double elements gives you [nil, nil, ...]) so it's not possible to mirror find's behavior.
indexOf is not find even if implemented using it.

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I have been studying your code in ExSwift and am puzzled about the Element keyword. Where is it defined? What the heck does it mean? I can infer from the code what it does but how did you know about it or how to use it?

Keep up the great work! Thanks for sharing!

Mark Hamilton

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@markhamilton1 typealias Element = T is defined in the standard library, precisely in struct Array<T> (in Xcode click on the Array keyword while pressing cmd).

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