Optional Extension

OptionalString.md

String Optional Extension

Swift3.1

extension Optional where Wrapped == String {
var isNilOrEmpty: Bool {
        return ((self as? String) ?? "").isEmpty
    }
}

Testing

func testNilOrEmpty() {
    let nilString: String? = nil
    XCTAssertTrue(nilString.isNilOrEmpty)

    let emptyString: String? = ""
    XCTAssertTrue(emptyString.isNilOrEmpty)

    let someText: String? = "lorem"
    XCTAssertFalse(someText.isNilOrEmpty)
}