dart is number code example

Example 1: dart number types

EXPRESSION						NATIVE	WEB
1 is int                      	True	True
1 is double                   	False	True
1.0 is int                    	False	True
1.0 is double                 	True	True
(0.5 + 0.5) is int            	False	True
(0.5 + 0.5) is double         	True	True
3.14 is int                   	False	False
3.14 is double                	True	True
double.infinity is int        	False	True
double.nan is int             	False	False
1.0.runtimeType               	double	int
1.runtimeType                 	int	int
1.5.runtimeType               	double	double

Example 2: flutter check if string is number dart

bool isNumeric(String s) {
 if (s == null) {
   return false;
 }
 return double.tryParse(s) != null;
}