Use static variable in function()

Question

I would know if we can declare a static var in a function, as we can do in JavaScript.

When I callback my function, my variable keep her last affectation.

Or

Answer 1

You can use Closures, in this example I have created a counter as follows:

void mian(){
 var my_counter = counter(5);
 for (var i = 0; i < 10; i++) {
   print(my_counter());
 }
}

Function counter(int n) {
  var number = 0;
  var func = () {
    if (number < n) {
      number++;
      return number;
    } else {
      number = 1;
      return number;
    }
  };
  return func;
}

or also a Generator:

Iterable count(int n) sync* {
  var number = 0;
  while (number < n) {
    yield number++;
  }
}