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Dart Function.appy() does not work on Color.fromARGB(a, r, g, b);

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Experimenting with Function.apply() to pass a list of positional parameters. But why doesn't a constructor method work for class Color?

var x = Function.apply(Color.fromARGB, [255, 66, 165, 245]);

Error Message: The getter 'fromARGB' isn't defined for the class 'Color'.

Here is the constructor.

const Color.fromARGB(int a, int r, int g, int b) :
 value = (((a & 0xff) << 24) |
 ((r & 0xff) << 16) |
 ((g & 0xff) << 8) |
 ((b & 0xff) << 0)) & 0xFFFFFFFF;

constructor dart flutter

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asked Mar 26 at 3:16

user603749user603749

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0

Experimenting with Function.apply() to pass a list of positional parameters. But why doesn't a constructor method work for class Color?

var x = Function.apply(Color.fromARGB, [255, 66, 165, 245]);

Error Message: The getter 'fromARGB' isn't defined for the class 'Color'.

Here is the constructor.

const Color.fromARGB(int a, int r, int g, int b) :
 value = (((a & 0xff) << 24) |
 ((r & 0xff) << 16) |
 ((g & 0xff) << 8) |
 ((b & 0xff) << 0)) & 0xFFFFFFFF;

constructor dart flutter

share|improve this question

asked Mar 26 at 3:16

user603749user603749

6471212 silver badges2222 bronze badges

add a comment | 

Experimenting with Function.apply() to pass a list of positional parameters. But why doesn't a constructor method work for class Color?

var x = Function.apply(Color.fromARGB, [255, 66, 165, 245]);

Error Message: The getter 'fromARGB' isn't defined for the class 'Color'.

Here is the constructor.

const Color.fromARGB(int a, int r, int g, int b) :
 value = (((a & 0xff) << 24) |
 ((r & 0xff) << 16) |
 ((g & 0xff) << 8) |
 ((b & 0xff) << 0)) & 0xFFFFFFFF;

constructor dart flutter

share|improve this question

asked Mar 26 at 3:16

user603749user603749

6471212 silver badges2222 bronze badges

var x = Function.apply(Color.fromARGB, [255, 66, 165, 245]);

Error Message: The getter 'fromARGB' isn't defined for the class 'Color'.

const Color.fromARGB(int a, int r, int g, int b) :
 value = (((a & 0xff) << 24) |
 ((r & 0xff) << 16) |
 ((g & 0xff) << 8) |
 ((b & 0xff) << 0)) & 0xFFFFFFFF;

constructor dart flutter

constructor dart flutter

share|improve this question

asked Mar 26 at 3:16

user603749user603749

6471212 silver badges2222 bronze badges

share|improve this question

asked Mar 26 at 3:16

user603749user603749

6471212 silver badges2222 bronze badges

asked Mar 26 at 3:16

user603749user603749

6471212 silver badges2222 bronze badges

asked Mar 26 at 3:16

user603749user603749

6471212 silver badges2222 bronze badges

1 Answer
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1

A named constructor is not a Function in Dart.

The current way to write your sample is:

var x = Function.apply(
 (int a, int r, int g, int b) => Color.fromARGB(a, r, g, b),
 [255, 66, 165, 245]);

https://github.com/dart-lang/language/issues/216 is the canonical issue to track requesting support for "tearing off" a constructor to treat it as a Function.

share|improve this answer

answered Mar 26 at 21:17

Nate BoschNate Bosch

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1

A named constructor is not a Function in Dart.

The current way to write your sample is:

var x = Function.apply(
 (int a, int r, int g, int b) => Color.fromARGB(a, r, g, b),
 [255, 66, 165, 245]);

https://github.com/dart-lang/language/issues/216 is the canonical issue to track requesting support for "tearing off" a constructor to treat it as a Function.

share|improve this answer

answered Mar 26 at 21:17

Nate BoschNate Bosch

1,8691111 silver badges1212 bronze badges

add a comment | 

1

A named constructor is not a Function in Dart.

The current way to write your sample is:

var x = Function.apply(
 (int a, int r, int g, int b) => Color.fromARGB(a, r, g, b),
 [255, 66, 165, 245]);

https://github.com/dart-lang/language/issues/216 is the canonical issue to track requesting support for "tearing off" a constructor to treat it as a Function.

share|improve this answer

answered Mar 26 at 21:17

Nate BoschNate Bosch

1,8691111 silver badges1212 bronze badges

add a comment | 

A named constructor is not a Function in Dart.

The current way to write your sample is:

var x = Function.apply(
 (int a, int r, int g, int b) => Color.fromARGB(a, r, g, b),
 [255, 66, 165, 245]);

https://github.com/dart-lang/language/issues/216 is the canonical issue to track requesting support for "tearing off" a constructor to treat it as a Function.

share|improve this answer

answered Mar 26 at 21:17

Nate BoschNate Bosch

1,8691111 silver badges1212 bronze badges

var x = Function.apply(
 (int a, int r, int g, int b) => Color.fromARGB(a, r, g, b),
 [255, 66, 165, 245]);

share|improve this answer

answered Mar 26 at 21:17

Nate BoschNate Bosch

1,8691111 silver badges1212 bronze badges

answered Mar 26 at 21:17

Nate BoschNate Bosch

1,8691111 silver badges1212 bronze badges

answered Mar 26 at 21:17

Nate BoschNate Bosch

1,8691111 silver badges1212 bronze badges