inspect as an extension on Sequence

inspect.swift

extension Sequence {
    public func inspect(
        _ body: (Element) throws -> Void
        ) rethrows  -> Self {
        for element in self {
            try body(element)
        }
        return self
    }
}

You can add inspection in a transformation pipeline to see the values.
It's like forEach. Except that you can keep on going.

E.g.

someArray.filter. { … }.inspect { print($0) }.map { … }