मान लीजिए, हमारे पास ऑब्जेक्ट्स का निम्नलिखित ऐरे है -
const arr = [ { "date" : "2010-01-01", "price" : 30 }, { "date" : "2010-02-01", "price" : 40 }, { "date" : "2010-03-01", "price" : 50 }, { "date" : "2010-01-01", "price2" : 45 }, { "date" : "2010-05-01", "price2" : 40 }, { "date" : "2010-10-01", "price2" : 50 } ];हमें एक JavaScript फ़ंक्शन लिखना है जो ऐसा ऐरे लेता है। फ़ंक्शन को फिर ऑब्जेक्ट्स को उनके "date" प्रॉपर्टी के आधार पर मर्ज करना चाहिए।
उदाहरण
const arr = [ { "date" : "2010-01-01", "price" : 30 }, { "date" : "2010-02-01", "price" : 40 }, { "date" : "2010-03-01", "price" : 50 }, { "date" : "2010-01-01", "price2" : 45 }, { "date" : "2010-05-01", "price2" : 40 }, { "date" : "2010-10-01", "price2" : 50 } ]; const mergeArray = (arr = []) => { const data = arr.slice(); data.sort((a, b) => new Date(a.date) - new Date(b.date)) const res = [] data.forEach(el => { if(!this[el.date]) { this[el.date] = { date: el.date, price: null, price2: null } res.push(this[el.date]) } this[el.date] = Object.assign(this[el.date], el) }); return res; } console.log(JSON.stringify(mergeArray(arr), undefined, 4));आउटपुट
कंसोल में आउटपुट होगा -
[ { "date": "2010-01-01", "price": 30, "price2": 45 }, { "date": "2010-02-01", "price": 40, "price2": null }, { "date": "2010-03-01", "price": 50, "price2": null }, { "date": "2010-05-01", "price": null, "price2": 40 }, { "date": "2010-10-01", "price": null, "price2": 50 } ] 
