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flutter optional parameter

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YOU.com answered on April 29, 2021 Popularity 9/10 Helpfulness 1/10

answer flutter optional parameter

related dart optional parameters

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flutter optional parameter

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void greet(String name, {String prefix = 'Hello'}) {
  print('$prefix, $name!');
}

void main() {
  greet('Alice'); // Output: Hello, Alice!
  greet('Bob', prefix: 'Hi'); // Output: Hi, Bob!
}

Popularity 9/10 Helpfulness 1/10 Language dart

Source: Grepper

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Contributed on Sep 11 2023

YOU.com

0 Answers Avg Quality 2/10

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dart optional parameters

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Curly brackets {} are used to specify optional, named parameters in Dart.
or use [] to specify optional parameters aswell
readFile(String name, {String mode, String charset = 'utf-8'}) {
  // empty
}
Named parameters are referenced by name,
which means that they can be used during the function
invocation in an order different from the function declaration.

readFile('hello.dart','14');
readFile('hello.dart', mode: 'w+');
readFile('hello.dart', charset: 'iso8859-1');
readFile('hello.dart', charset: 'iso8859-1', mode: 'w+');
readFile('hello.dart', mode: 'w+', charset: 'iso8859-1');


readFile2(String name, [String? mode]) {
  // empty
}

readFile2('hello.dart','w+');
readFile2('hello.dart');

Popularity 10/10 Helpfulness 2/10 Language dart

Source: Grepper

Tags: dart

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Contributed on Apr 29 2021

Adorable Alpaca

0 Answers Avg Quality 2/10

flutter make parameters of a class optional

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class TextInputWithIcon extends StatefulWidget {
  final String iconPath;
  final String placeHolder;
  final Function(bool)? onFocusChange; // nullable and optional
  
  const TextInputWithIcon(
      {Key? key,
      required this.iconPath, // non-nullable and required
      this.placeHolder = "", // non-nullable but optional with a default value
      this.onFocusChange, // nullable and optional
      })
      : super(key: key); 

  @override
  _TextInputWithIconState createState() => _TextInputWithIconState();

}

https://levelup.gitconnected.com/3-types-of-dart-parameters-and-using-them-correctly-61d4204d53a5#69be

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: class flutter

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Contributed on Feb 20 2023

Isijola Ademie

0 Answers Avg Quality 2/10

make dynamic parameters optional in flutter

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Making a dynamic parameter optional

>> bind it to the class immediately after super.key e.g {super.key, this.optionalParameter}
>> declare it adding ? to it's type e.g final String? this.optionalParameter

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: levelup.gitconnected.com

Tags: dynamic flutter

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Contributed on Feb 22 2023

Isijola Ademie

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flutter optional parameter

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