For error handling in the case of String variables, null is used in Kotlin and nil is used in Swift. However, it works exactly in the same way irrespective of the keyword being used. … Kotlin vs Swift Comparison table. ConceptsKotlinSwiftSyntax differenceValletfunfunctraitprotocolnullnilKotlin vs Swift | 5 Most Valuable Differences You Should Know www.educba.com › … › Top Differences Tutorial