Parameterized string variables in Dart

Question

How can I have a string resource in Dart that I can refer to and replace variables in the string?

In Android, with strings.xml we can do this:

<string name="error_message">Error connecting to “%s”</string>

my_message = resources.getString(R.string.error_message, "Google")
// Error connecting to Google

In Python, we can do this:

print("I am %d years old!" % 10)
# I am 10 years old!

I want to do something like this in Dart:

var a = "My name is $s";
print(a, "Bob");
// My name is Bob

I don't want this:

var b = "World";
a = "Hello $b";
print(a)
// Hello World

Answer 1

The Flutter counterpart to strings.xml in Android development is the intl package. It serves the same purpose of offering an ability to internationalize apps. However, you do not have to use it for internationalization, the same way you do not have to translate strings.xml.

intl

The way you can define a message is the following:

class ParameterizedStrings {

  String errorMessage(String name) => Intl.message(
      'Error connecting to $name',
      args: [name]);
}

You can learn more here.