C#、Swift、Kotlin、Java语法对比

c#	swift	kotlin	java
byte	-	Byte	byte
bool	Bool	Boolean	boolean
int	Int	Int	int
long	-	Long	long
float	Float	Float	float
double	Double	Double	double
string	String	String	String
decimal	Decimal	BigDecimal	BigDecimal

c#	swift	kotlin	java
int?	Int?	Int?	Integer
string	String?	String?	String
decimal?	Decimal?	BigDecimal?	BigDecimal

c#	swift	kotlin	java
var a = 1	let a: Int = 1	val a: Int = 1	int a = 1
var a = 1	var a: Int = 1	var a: Int = 1	int a = 1

c#	swift	kotlin	java
async (p1, p2) => { ... }	{ (p1: type1, p2: type2) in ... }	{ p1, p2 -> .... }	(p1, p2) -> { ... }