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function objectEntries(obj) {
    let index = 0;

    // In ES6, you can use strings or symbols as property keys,
    // Reflect.ownKeys() retrieves both
    const propKeys = Reflect.ownKeys(obj);

    return {
        [Symbol.iterator]() {
            return this;
        },
        next() {
            if (index < propKeys.length) {
                const key = propKeys[index];
                index++;
                return { value: [key, obj[key]] };
            } else {
                return { done: true };
            }
        }
    };
}

const obj = { first: 'Jane', last: 'Doe' };
for (const [key,value] of objectEntries(obj)) {
    console.log(`${key}: ${value}`);
}

// Output:
// first: Jane
// last: Doe