Type

isNumeric

 static bool isNumeric(String? string) 

The 'isNumeric' method checks if 'string' is numeric by attempting to parse it as a double.

Infinity and NaN are not treated as numbers.

Strings.isNumeric('abc');
-> false
Strings.isNumeric('1234');
-> true

If null is passed the 'string' is treated as an empty string and 'false' is returned.

extension

The 'isNumeric' method is available as an extension to the String class

'ABCD'.isNumeric();
-> false