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dart optional parameters

Adorable Alpaca answered on April 29, 2021 Popularity 10/10 Helpfulness 2/10

answer dart optional parameters

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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

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Tags: dart optional-parameters

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Contributed on Apr 29 2021

Adorable Alpaca

0 Answers Avg Quality 2/10

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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

dart optional parameters

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