मान लीजिए, हमारे पास ऑब्जेक्ट्स का एक ऐरे है जैसे कि -
const arr = [ {"id":7,"name":"Kuwait","parentId":2}, {"id":4,"name":"Iraq","parentId":2}, {"id":10,"name":"Qatar","parentId":2}, {"id":2,"name":"Middle East","parentId":1}, {"id":3,"name":"Bahrain","parentId":2}, {"id":6,"name":"Jordan","parentId":2}, {"id":8,"name":"Lebanon","parentId":2}, {"id":1,"name":"Africa/Middle East","parentId":null}, {"id":5,"name":"Israel","parentId":2}, {"id":9,"name":"Oman","parentId":2} ];हमें एक JavaScript फ़ंक्शन लिखना है जो ऐसा ऐरे लेता है। फ़ंक्शन को फिर एक नया ऐरे तैयार करना चाहिए जिसमें ऑब्जेक्ट्स उनके पैरेंट्स के अनुसार ग्रुप किए गए हों।
इसलिए, आउटपुट इस तरह दिखना चाहिए -
const output = [ {"id":55,"text":"Africa/Middle East","children":[ {"id":2,"text":"Middle East","children": [{"id":7,"name":"Kuwait","children":[]}, {"id":4,"name":"Iraq","children":[]}, {"id":10,"name":"Qatar","children":[]}, {"id":3,"name":"Bahrain","children":[]}, {"id":6,"name":"Jordan","children":[]}, {"id":8,"name":"Lebanon","children":[]}, {"id":5,"name":"Israel","children":[]}, {"id":9,"name":"Oman","children":[]}]} ]; उदाहरण
const arr = [ {"id":7,"name":"Kuwait","parentId":2}, {"id":4,"name":"Iraq","parentId":2}, {"id":10,"name":"Qatar","parentId":2}, {"id":2,"name":"Middle East","parentId":1}, {"id":3,"name":"Bahrain","parentId":2}, {"id":6,"name":"Jordan","parentId":2}, {"id":8,"name":"Lebanon","parentId":2}, {"id":1,"name":"Africa/Middle East","parentId":null}, {"id":5,"name":"Israel","parentId":2}, {"id":9,"name":"Oman","parentId":2} ]; const transformTree = (data, root = null) => { const res = []; const map = {}; data.forEach((el) => { el.children = map[el.id] && map[el.id].children || []; map[el.id] = el; if (el.parentId === root) { res.push(el); } else { map[el.parentId] = map[el.parentId] || {}; map[el.parentId].children = map[el.parentId].children || []; map[el.parentId].children.push(el); }; }); return res; }; console.log(JSON.stringify(transformTree(arr), undefined, 4));आउटपुट
कंसोल में आउटपुट होगा -
[ { "id": 1, "name": "Africa/Middle East", "parentId": null, "children": [ { "id": 2, "name": "Middle East", "parentId": 1, "children": [ { "id": 7, "name": "Kuwait", "parentId": 2, "children": [] }, { "id": 4, "name": "Iraq", "parentId": 2, "children": [] }, { "id": 10, "name": "Qatar", "parentId": 2, "children": [] }, { "id": 3, "name": "Bahrain", "parentId": 2, "children": [] }, { "id": 6, "name": "Jordan", "parentId": 2, "children": [] }, { "id": 8, "name": "Lebanon", "parentId": 2, "children": [] }, { "id": 5, "name": "Israel", "parentId": 2, "children": [] }, { "id": 9, "name": "Oman", "parentId": 2, "children": [] } ] } ] } ] 
