# Custom ranges with iterators

This is the same idea of Enumerable.Range() method in C#.

Unlike C#, JavaScript doesn't have a built-in way of generating these ranges.

So, let's create one 😄

You can generate a range by using:

• the prototype of the Number
• iterator
• generator
• the Symbol.iterator

Number.prototype[Symbol.iterator] = function* () {
  for (let i = 0; i < this; i++) {
    yield i;
  }
}

var range = [...5];
console.log(range);

And this will create an array from 0 to 4:

Array [ 0, 1, 2, 3, 4 ]