Mysterious “extra argument in call” error in Array extension method [duplicate]

Answer 1

The compiler is conflating Swift.Array.min(by:), which only takes a single argument, with the global function Swift.min(_:_:) that you're intending to use.

Explicitly qualifying the global function by prefixing it with its module name (Swift) resolves the issue:

extension Array {
    func chunked(by chunkSize: Int) -> [[Element]] {
        return stride(from: 0, to: self.count, by: chunkSize).map {
            Array(self[$0 ..< Swift.min($0 + chunkSize, self.count)]) // fixed
        }
    }
}