A string can be cast to an integer using the **`int.parse()` method** in Dart. The method takes a string as an argument and converts it into an integer.

# Code

The following code snippet demonstrates the usage of the `int.parse` method:

import 'dart:convert';

void main() {
    var a = 10; // An integer
    var b = "20"; // A string
    var c = int.parse(b);
    print(a + c);
}

The method also accepts strings that start with $0x$; i.e., the format for *hexadecimal* numbers. Consider the code below which converts a hexadecimal string into an integer:​

import 'dart:convert';

void main() {
    var a = "0x1E"; // Hexadecimal value for 30
    var b = int.parse(a);
    print(b);
}

> The method will throw a `FormatException` if the input is invalid. The method won’t accept characters that are not ***radix-10*** or hexadecimal (e.g., “abc”).


How to cast a string to an integer in Dart

Convert strings to integers in Dart with int.parse(). Handles decimal and hexadecimal inputs; invalid formats throw FormatException.