ArrayInstance MethodschunkconcatdifferencedifferenceBydifferenceWithdropdropRightdropRightWhiledropWhilefindIndexfindLastIndexintersectionintersectionByintersectionWithsliceDateInstance MethodsisAfterisBeforetoStringtoStringPropertieserayearmonthdayminutesecondnanosecondweekdayweekdayOrdinalquarterweekOfMonthweekOfYearIntdigitsdownTofactorialisEvenisInisOddtimesupToStringdatePowered by factorialfactorial() -> IntReturn the factorial of int Returns Factorial of int Swift5.factorial() // -> 120 0.factorial() // -> 1
