What is the difference between named and positional parameters in Dart

0 votes

Dart supports both named optional parameters and positional optional parameters. What are the differences between the two?

Also, how can you tell if an optional parameter was actually specified?

Mar 21, 2023 in Flutter by Ashwini
• 5,430 points
3,076 views

1 answer to this question.

0 votes

In Dart, positional parameters are specified by their position in the parameter list, while named parameters are identified by a name.

The main differences between the two are:

  • Positional parameters must be passed in the same order as they appear in the function signature, whereas named parameters can be passed in any order.
  • Positional parameters are defined by their position in the parameter list, whereas named parameters are defined by their name.
  • Named parameters are optional by default and are enclosed in curly braces ({}) in the function signature, whereas positional parameters are optional when they have a default value and are enclosed in square brackets ([]) in the function signature.

To tell if an optional parameter was specified or not, you can use the null value. If an optional parameter has not been specified, its value will be null. You can also use the required keyword to indicate that a named parameter is required and must be provided by the caller. If a required named parameter is not provided, an error will be thrown at runtime.

answered Mar 21, 2023 by seena

Related Questions In Flutter

0 votes
1 answer

What is the difference between functions and classes to create reusable widgets?

In Flutter, you can create reusable widgets ...READ MORE

answered Mar 24, 2023 in Flutter by vinayak
1,027 views
0 votes
1 answer

What is the relation between stateful and stateless widgets in Flutter?

In Flutter, a widget is either stateless ...READ MORE

answered Mar 28, 2023 in Flutter by seena
2,143 views
0 votes
1 answer

Is Flutter/Dart valuable in the professional setting?

Yes, Flutter and Dart are valuable skills ...READ MORE

answered Mar 21, 2023 in Flutter by vani
321 views
0 votes
1 answer

What is the use of Material Widget?

The Material widget is a key component ...READ MORE

answered Mar 21, 2023 in Flutter by pooja
934 views
0 votes
1 answer

Dart_LoadScriptFromKernel: The binary program does not contain 'main'.

Hi@akhtar, You need to add the main() function ...READ MORE

answered Jul 21, 2020 in Others by MD
• 95,440 points
3,335 views
0 votes
1 answer

How to install Dart in Windows system?

Hi@akhtar, Dart is the programming language used to code Flutter apps. ...READ MORE

answered Jul 21, 2020 in Others by MD
• 95,440 points
890 views
0 votes
1 answer

flutter run: No connected devices

Hi@akhtar, To prepare to run and test your ...READ MORE

answered Jul 21, 2020 in Others by MD
• 95,440 points
3,951 views
0 votes
1 answer

How to create a function in Dart language?

Hi@akhtar, There are many function types available in ...READ MORE

answered Jul 22, 2020 in Others by MD
• 95,440 points
582 views
0 votes
1 answer
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP