Dart: documentation

To check whether a string is a numeric string, you can use the double. tryParse() method . If the return equals null then the input is not a numeric string, otherwise, it is.

In the Dart programming language, an integer is represented by the int keyword . As we may know, integers include whole numbers (i.e., non-decimal positive and negative numbers).

The Dart language is type safe: it uses a combination of static type checking and runtime checks to ensure that a variable’s value always matches the variable’s static type, sometimes referred to as sound typing. Although types are mandatory, type annotations are optional because of type inference.