मान लीजिए हमारे पास एक JSON ऑब्जेक्ट है जिसमें कुछ देशों के कुछ शहरों की लोकेशन की जानकारी है:
const countryInfo = { country: [{ name: "Bangladesh", province: [{ name:"Dhaka", city: [{ name:"Tangail", lat: '11' }, { name:"Jamalpur", lat: '12' }] }, { name: "Khulna", city: [{ name:"Jossore", lat: '22' }, { name:"Tangail", lat: '23' }] }, { name: "Rajshahi", city: [{ name:"Pabna", lat: '33' }, { name:"Rangpur", lat: '33' }] }] },{ name: "India", province: [{ name:"West Bengal", city: [{ name:"Calcutta", lat: '111' }, { name:"Tangail", lat: '112' }] }, { name: "Uttar Pradesh", city: [{ name:"Agra", lat: '122' }, { name:"Tajmahal", lat: '123' }] }, { name: "Rajasthan", city: [{ name:"Kanpur", lat: '131' }, { name:"Jaypur", lat: '132' }] }] }] };हमें एक जावास्क्रिप्ट फंक्शन लिखना है जो ऐसा ऑब्जेक्ट और एक सर्च स्ट्रिंग ले।
हमें फिर सर्च स्ट्रिंग से मेल खाने वाले सभी सिटी नेम्स को खोजना चाहिए और क्वेरी से मेल खाने वाले सभी सिटी ऑब्जेक्ट्स का ऐरे वापस करना चाहिए।
उदाहरण
इसके लिए कोड:
const countryInfo = { country: [{ name: "Bangladesh", province: [{ name:"Dhaka", city: [{ name:"Tangail", lat: '11' }, { name:"Jamalpur", lat: '12' }] }, { name: "Khulna", city: [{ name:"Jossore", lat: '22' }, { name:"Tangail", lat: '23' }] }, { name: "Rajshahi", city: [{ name:"Pabna", lat: '33' }, { name:"Rangpur", lat: '33' }] }] },{ name: "India", province: [{ name:"West Bengal", city: [{ name:"Calcutta", lat: '111' }, { name:"Tangail", lat: '112' }] }, { name: "Uttar Pradesh", city: [{ name:"Agra", lat: '122' }, { name:"Tajmahal", lat: '123' }] }, { name: "Rajasthan", city: [{ name:"Kanpur", lat: '131' }, { name:"Jaypur", lat: '132' }] }] }] }; const searchForCity = (obj, query) => { const cities = obj.country.reduce((acc, val) => { val.province.forEach(el => { el.city.forEach(elm => { acc.push(elm); }); }); return acc; },[]); const res = cities.filter(el => { return el.name === query; }); return res; }; console.log(searchForCity(countryInfo, 'Tangail'));आउटपुट
कंसोल में आउटपुट:
[ { name: 'Tangail', lat: '11' }, { name: 'Tangail', lat: '23' }, { name: 'Tangail', lat: '112' } ] 
