Flutter converting String to Boolean

Question

I am having a String that i would like to convert to Boolean Below is how the string looks like

String isValid = "false";

The String isValid can either be true or false

Is there a way i can directly convert this String isValid to Boolean. I have tried Sample questions and solutions but they are just converting Strings which are hard coded, for example most of the answers are just when the string is true

Answer 1

On top of my head, you can create an extension method for string data-type for your own need with all sorts of requirements checks and custom exceptions to beautify your desired functionalities. Here is an example:

import 'package:test/expect.dart';

void main(List<String> args) {
  String isValid = "true";

  print(isValid.toBoolean());
}

extension on String {
  bool toBoolean() {
    print(this);
    return (this.toLowerCase() == "true" || this.toLowerCase() == "1")
        ? true
        : (this.toLowerCase() == "false" || this.toLowerCase() == "0"
            ? false
            : throwsUnsupportedError);
  }
}

Here, in this example, I've created a variable named isValid in the main() method, which contains a string value. But, look closely at how I've parsed the string value to a bool value using the power with extension declared just a few lines below.

Same way, you can access the newly created string-extension method toBoolean() from anywhere. Keep in mind, if you're not in the same file where the toBoolean() extension is created, don't forget to import the proper reference.

Bonus tips: You can also access toBoolean() like this,

bool alternateValidation = "true".toBoolean();

Happy coding 😊