'use strict';

console.log('iterator in Symbol:', 'iterator' in Symbol);

const generateNumbersObject = { start: 1, end: 10 };

generateNumbersObject[Symbol.iterator] = function () {

let value = this.start;

return {

next: () => ({

value,

done: value++ === this.end + 1,

}),

};

};

Object.defineProperty(generateNumbersObject, Symbol.iterator, {

enumerable: false,

configurable: false,

});

console.dir(generateNumbersObject);

console.log(Object.getOwnPropertySymbols(generateNumbersObject));

for (const number of generateNumbersObject) {

console.log(number);

}

const useIterable = (...iterableObjects) =>

iterableObjects.reduce((prev, cur) => prev + cur);

const sum = useIterable(...generateNumbersObject);

console.log('sum:', sum);