Kuidas töötavad JavaScriptis generaatorid võrreldes tavaliste funktsioonidega?

Generators in JavaScript are functions that can pause their execution and return intermediate values using the yield keyword. Unlike regular functions, which execute fully and return a single value, generators allow creating iterators with lazy generation of values.

Example of a generator:

function* countUpTo(max) {
  let count = 1;
  while (count <= max) {
    yield count; // pauses execution and returns the value
    count++;
  }
}

const counter = countUpTo(3);
console.log(counter.next().value); // 1
console.log(counter.next().value); // 2
console.log(counter.next().value); // 3
console.log(counter.next().done);  // true

Therefore, generators are useful for working with sequences of data that do not need to be computed immediately in their entirety.