Dart set default value for parameter

1 Min Read

In Dart, you can set a default value for a parameter in a function definition. The default value is used if the caller does not provide a value for that parameter.

Here’s an example of a function with a default value for a parameter:

void printMessage(String message, [String sender = 'Unknown']) {
  print('$sender: $message');

In this example, the sender parameter has a default value of 'Unknown'. If you call printMessage and only provide a value for the message parameter, the default value for sender will be used:

// Output: Unknown: Hello

If you want to provide a value for sender, you can do so when you call the function:

printMessage('Hello', 'John');
// Output: John: Hello

In this way, you can use default values for parameters to make your functions more flexible and easier to use.

Share this Article
Leave a comment