Calling a function with an array of parameters in Dart

Question

I'm trying to call a function in dart with a set of parameters that is provided in an array. I want to be able to pass the parameters to the function without knowing how many parameters there will be.

Ex:

someFunc(var a, var b, var c) {...}
paramArray = [1,2,3];

callFunction(var func, var params) {
  //Here is a sloppy workaround to what I want the functionality to be
  switch(params.length) {
  case 0:
      func()
      break;
    case 1: 
      func(params[0])
      break;
    case 2: 
      func(params[0], params[1])
      break;
    ...
  }
}

callFunction(someFunc, paramArray);

Does there exist a cleaner way to do this in dart without changing the signature of someFunc?

score 4 · Answer 1 · answered Mar 31 '17 at 06:49

4

The Function.apply method does precisely what you want. You can do Function.apply(func, params) and it will call func if the parameters match (and throw if they don't).

answered Mar 31 '17 at 06:49

lrn

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score 3 · Answer 2 · answered Mar 23 '17 at 01:58

3

Not to my knowledge. At this point, Dart doesn't support varargs. For now, just take an Iterable as a parameter instead.

answered Mar 23 '17 at 01:58

Tobe Osakwe

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score 0 · Answer 3 · edited May 23 '17 at 11:46

0

I posted a similar question not so long ago : Packing/Unpacking arguments in Dart

Currently not supported but the dart team is aware of this feature. Not their priority though.

edited May 23 '17 at 11:46

Community

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answered Mar 23 '17 at 04:14

aelayeb

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Calling a function with an array of parameters in Dart

3 Answers3