다음과 같은 객체 배열이 있다고 가정해 보겠습니다. -
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} ];
우리는 그러한 배열을 취하는 JavaScript 함수를 작성해야 합니다. 그런 다음 함수는 부모에 따라 그룹화된 개체를 포함하는 새 배열을 준비해야 합니다.
따라서 출력은 다음과 같아야 합니다. -
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":[]}]} ];
예시
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));
출력
콘솔의 출력은 -
[ { "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": [] } ] } ] } ]