[swift-dev] Scala updated equivalent

[Alexandre Lopoukhine]

Hello everyone!

What do you all think about adding the equivalent of Scala’s update method to collections that have the insert() func? This would likely take the form of:

public func inserted(newElement: Self.Generator.Element, atIndex i: Self.Index) -> Self {
    var modified = self
    modified.insert(newElement, atIndex: i)
    return modified
}

I’ve had to do this manually quite a lot in my various programs, where I’ve had to return an array or dictionary with just one element modified, and I have a feeling that I am not alone. I think that this is quite a natural way to go about things, and the addition would cut down on boilerplate code.

— Sasha

P.S. Alternatives could be “.withInserted(el, atIndex: i)” or “.with(el, insertedAtIndex: i)"