मान लीजिए, हमारे पास ऑब्जेक्ट्स की एक सरणी है जैसे -
const arr = [ {"location":"Kirrawee","identity_long":"student"}, {"location":"Kirrawee","identity_long":"visitor"}, {"location":"Kirrawee","identity_long":"visitor"}, {"location":"Kirrawee","identity_long":"worker"}, {"location":"Sutherland","identity_long":"student"}, {"location":"Sutherland","identity_long":"resident"}, {"location":"Sutherland","identity_long":"worker"}, {"location":"Sutherland","identity_long":"resident"}, {"location":"Miranda","identity_long":"resident"}, {"location":"Miranda","identity_long":"worker"}, {"location":"Miranda","identity_long":"student"}, {"location":"Miranda","identity_long":""}, {"location":"Miranda","identity_long":"worker"}, {"location":"Miranda","identity_long":"resident"} ];हमें एक JavaScript फ़ंक्शन लिखना है जो ऐसी ऑब्जेक्ट्स की सरणी लेता है। फ़ंक्शन को ऑब्जेक्ट्स की एक नई सरणी तैयार करनी चाहिए जिसमें सभी (समान) ऑब्जेक्ट्स location गुण के आधार पर एक साथ ग्रुप हों।
और ऑब्जेक्ट्स को एक count गुण निर्दिष्ट किया जाना चाहिए जिसमें मूल ऑब्जेक्ट्स की सरणी में उनके प्रकट होने की संख्या हो।
इसलिए, उपरोक्त सरणी के लिए, आउटपुट इस तरह दिखना चाहिए -
const output = [ {"location":"Kirrawee","identity":"student","count":1}, {"location":"Kirrawee","identity":"visitor","count":2}, {"location":"Kirrawee","identity":"worker","count":1}, {"location":"Sutherland","identity":"student","count":1}, {"location":"Sutherland","identity":"resident","count":2}, {"location":"Sutherland","identity":"worker","count":1}, {"location":"Miranda","identity":"resident","count":2}, {"location":"Miranda","identity":"worker","count":2}, {"location":"Miranda","identity":"student","count":1} ];उदाहरण
इसके लिए कोड होगा -
const arr = [ {"location":"Kirrawee","identity_long":"student"}, {"location":"Kirrawee","identity_long":"visitor"}, {"location":"Kirrawee","identity_long":"visitor"}, {"location":"Kirrawee","identity_long":"worker"}, {"location":"Sutherland","identity_long":"student"}, {"location":"Sutherland","identity_long":"resident"}, {"location":"Sutherland","identity_long":"worker"}, {"location":"Sutherland","identity_long":"resident"}, {"location":"Miranda","identity_long":"resident"}, {"location":"Miranda","identity_long":"worker"}, {"location":"Miranda","identity_long":"student"}, {"location":"Miranda","identity_long":""}, {"location":"Miranda","identity_long":"worker"}, {"location":"Miranda","identity_long":"resident"} ]; const groupArray = (arr = []) => { // मैप बनाएं let map = new Map() for (let i = 0; i < arr.length; i++) { const s = JSON.stringify(arr[i]); if (!map.has(s)) { map.set(s, { location: arr[i].location, identity: arr[i].identity_long, count: 1, }); } else { map.get(s).count++; } } const res = Array.from(map.values()) return res; }; console.log(groupArray(arr));आउटपुट
कंसोल में आउटपुट होगा -
[ { location: 'Kirrawee', identity: 'student', count: 1 }, { location: 'Kirrawee', identity: 'visitor', count: 2 }, { location: 'Kirrawee', identity: 'worker', count: 1 }, { location: 'Sutherland', identity: 'student', count: 1 }, { location: 'Sutherland', identity: 'resident', count: 2 }, { location: 'Sutherland', identity: 'worker', count: 1 }, { location: 'Miranda', identity: 'resident', count: 2 }, { location: 'Miranda', identity: 'worker', count: 2 }, { location: 'Miranda', identity: 'student', count: 1 }, { location: 'Miranda', identity: '', count: 1 } ] 
