Can we bump this topic for Swift 5?
Similar to how KeyPaths have a language support by extending Any we could provide a with function to any type.
extension Any {
@discardableResult
public func with(update: (inout Self) throws -> Void) rethrows -> Self {
var this = self
try update(&this)
return this
}
}
If we had a distinction between AnyObject and (not existing) AnyValue we could extend those instead in favor of a inout free with function for classes and also excluding function reference types.
One advantage the extension of Any adds over the pitched global function is that you can use it in combination with optional chaining.
var text: String? = ...
label.text = text?.with { /* mutate non-optional string */ }