JavaScript [ES6] implementation of pythons' range()

range.js

function* range(start, stop, step = 1)
{
	if (stop <= start & step > 0 | stop >= start & step < 0)
	{
		throw "Stop value is out of range";
	}
	else if (start >= stop & step > 0 | start <= stop & step < 0)
	{
		throw "Start value is out of range";
	}
	else
	{
		for (let i = start; i < stop & step > 0 | i > stop & step < 0; i += step)
		{
			yield(i);
		}
	}
}

for (let i of range(20, 0, -2))
{
	console.log(i);
}