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SOLVED: Day 40: "self" question

Forums > 100 Days of SwiftUI

Thus begins the definition of an extension on Bundle:

extension Bundle { func decode(_ file: String) -> [String: Astronaut] { guard let url = self.url(forResource: file, withExtension: nil) else { fatalError("Failed to locate (file) in bundle.") }

My only question is, what exactly is the "self" on line 3 doing for us? Usually I think of "self" as necessary to clear up confusion about which variable we're referring to (within the closure or outside the closure), but I don't see how there are two versions of anything here.

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Bundle has a method url(forResource:withExtension:). You are extending Bundle, so to refer to that instance you call it as self.url(forResource:withExtension:).

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Thanks!

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