custom-iterators-with-generators.js

var obj = {
	values: [2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34],
	start: 4,
	end: 13,
	*[Symbol.iterator]() {
		for (var i = this.start; i <= this.end; i++) {
			yield this.values[i];
		}	
	},
};

var myCustomArr = [ ...obj ];
console.log(myCustomArr);