Arguments of generator functions

Like other normal functions, generator functions can take arguments. These arguments can be used in yield expressions inside the generator functions.

In the code below, seq is a generator function with arguments start and number. start means the start number of generated values and number means the total number of generated values.

function *seq(start = 0, number = 10) {
  while (number-- > 0) {
    yield start++;
  }
}

debug(seq());
// -> Output values from 0 to 9

debug(seq(3));
// -> Output values from 3 to 12

debug(seq(3, 5));
// -> Output values from 3 to 7