javascript - 基于平面数据构建嵌套层次结构

Question

给定两个无序平面数组:

teamLinks {
  parentBpxTeamId,
  childBpxTeamId
}

teams {
  bpxId,
  ...
}

我想根据teamLinks将团队重组为嵌套层次结构(任意数量的级别)，并且我正在努力想出一种可行的(希望是有效的)方法来做到这一点。

所以数据最终应该是这样的:

[
  {
    bpxId: 1,
    children: [
      {
        bpxId: 2,
        children: [
          {
            bpxId: 3,
          }
        ]
      }
    ]
  }
]

如果teamLinks是:

[
  {
    parentBpxTeamId: 1,
    childBpxTeamId: 2,
  },
  {
    parentBpxTeamId: 2,
    childBpxTeamId: 3,
  }
]

const teams=[{bpxId:1},{bpxId:2},{bpxId:3},{bpxId:4},{bpxId:5},{bpxId:6},{bpxId:7},{bpxId:8},{bpxId:9},{bpxId:10},{bpxId:11},{bpxId:12},{bpxId:13},{bpxId:14},{bpxId:15},{bpxId:16},{bpxId:17},{bpxId:18},{bpxId:19},{bpxId:20},{bpxId:21},{bpxId:22},{bpxId:23},{bpxId:24},{bpxId:25},{bpxId:26},{bpxId:27},{bpxId:28},{bpxId:29},{bpxId:30},{bpxId:31},{bpxId:32},{bpxId:33},{bpxId:34},{bpxId:35},{bpxId:36},{bpxId:37},{bpxId:38},{bpxId:39},{bpxId:40},{bpxId:41},{bpxId:42},{bpxId:43},{bpxId:44},{bpxId:45},{bpxId:46},{bpxId:47},{bpxId:48},{bpxId:49},{bpxId:50},{bpxId:51},{bpxId:52},{bpxId:53},{bpxId:54},{bpxId:55},{bpxId:56},{bpxId:57},{bpxId:58},{bpxId:59},{bpxId:60},{bpxId:61},{bpxId:62},{bpxId:63},{bpxId:64},{bpxId:65},{bpxId:66},{bpxId:67},{bpxId:68},{bpxId:69},{bpxId:70},{bpxId:71},{bpxId:72},{bpxId:73},{bpxId:74},{bpxId:75},{bpxId:76},{bpxId:77},{bpxId:78},{bpxId:79},{bpxId:80},{bpxId:81},{bpxId:82},{bpxId:83},{bpxId:84},{bpxId:85},{bpxId:86},{bpxId:87},{bpxId:88},{bpxId:89},{bpxId:90},{bpxId:91},{bpxId:92},{bpxId:93},{bpxId:94},{bpxId:95},{bpxId:96},{bpxId:97},{bpxId:98},{bpxId:99},{bpxId:100},{bpxId:101},{bpxId:102},{bpxId:103},{bpxId:104},{bpxId:105},{bpxId:106},{bpxId:107},{bpxId:108},{bpxId:109},{bpxId:110},{bpxId:111},{bpxId:112},{bpxId:113},{bpxId:114},{bpxId:115},{bpxId:116},{bpxId:117},{bpxId:118},{bpxId:119},{bpxId:120},{bpxId:121},{bpxId:122},{bpxId:123},{bpxId:124},{bpxId:125},{bpxId:126},{bpxId:127},{bpxId:128},{bpxId:129},{bpxId:130},{bpxId:131},{bpxId:132},{bpxId:133},{bpxId:134},{bpxId:135},{bpxId:136},{bpxId:137},{bpxId:138},{bpxId:139},{bpxId:140},{bpxId:141},{bpxId:142},{bpxId:143},{bpxId:144},{bpxId:145},{bpxId:146},{bpxId:147},{bpxId:148},{bpxId:149},{bpxId:150},{bpxId:151},{bpxId:152},{bpxId:153},{bpxId:154},{bpxId:155},{bpxId:156},{bpxId:157},{bpxId:158},{bpxId:159},{bpxId:160},{bpxId:161},{bpxId:162},{bpxId:163},{bpxId:164},{bpxId:165},{bpxId:166},{bpxId:167},{bpxId:168},{bpxId:169},{bpxId:170},{bpxId:171},{bpxId:172},{bpxId:173},{bpxId:174},{bpxId:175},{bpxId:176},{bpxId:177},{bpxId:178},{bpxId:179},{bpxId:180},{bpxId:181},{bpxId:182},{bpxId:183},{bpxId:184},{bpxId:185},{bpxId:186},{bpxId:187},{bpxId:188},{bpxId:189},{bpxId:190},{bpxId:191},{bpxId:192},{bpxId:193},{bpxId:194},{bpxId:195},{bpxId:196},{bpxId:197},{bpxId:198},{bpxId:199},{bpxId:200},{bpxId:201},{bpxId:202},{bpxId:203},{bpxId:204},{bpxId:205},{bpxId:206},{bpxId:207},{bpxId:208},{bpxId:209},{bpxId:210},{bpxId:211},{bpxId:212},{bpxId:213},{bpxId:214},{bpxId:215},{bpxId:216},{bpxId:217},{bpxId:218},{bpxId:219},{bpxId:220},{bpxId:221},{bpxId:222},{bpxId:223},{bpxId:224},{bpxId:225},{bpxId:226},{bpxId:227},{bpxId:228},{bpxId:229},{bpxId:230},{bpxId:231},{bpxId:232},{bpxId:233},{bpxId:234},{bpxId:235},{bpxId:236},{bpxId:237},{bpxId:238},{bpxId:239},{bpxId:240},{bpxId:241},{bpxId:242},{bpxId:243},{bpxId:244},{bpxId:245},{bpxId:246},{bpxId:247},{bpxId:248},{bpxId:249},{bpxId:250},{bpxId:251},{bpxId:252},{bpxId:253},{bpxId:254},{bpxId:255},{bpxId:256},{bpxId:257},{bpxId:258},{bpxId:259},{bpxId:260},{bpxId:261},{bpxId:262},{bpxId:263},{bpxId:264},{bpxId:265},{bpxId:266},{bpxId:267},{bpxId:268},{bpxId:269},{bpxId:270},{bpxId:271},{bpxId:272},{bpxId:273},{bpxId:274},{bpxId:275},{bpxId:276},{bpxId:277},{bpxId:278},{bpxId:279},{bpxId:280},{bpxId:281},{bpxId:282},{bpxId:283},{bpxId:284},{bpxId:285},{bpxId:286},{bpxId:287},{bpxId:288},{bpxId:289},{bpxId:290},{bpxId:291},{bpxId:292},{bpxId:293},{bpxId:294},{bpxId:295},{bpxId:296},{bpxId:297},{bpxId:298},{bpxId:299},{bpxId:300},{bpxId:301},{bpxId:302},{bpxId:303},{bpxId:304},{bpxId:305},{bpxId:306},{bpxId:307},{bpxId:308},{bpxId:309},{bpxId:310},{bpxId:311},{bpxId:312},{bpxId:313},{bpxId:314},{bpxId:315},{bpxId:316},{bpxId:317},{bpxId:318},{bpxId:319},{bpxId:320},{bpxId:321},{bpxId:322},{bpxId:323},{bpxId:324},{bpxId:325},{bpxId:326},{bpxId:327},{bpxId:328},{bpxId:329},{bpxId:330},{bpxId:331},{bpxId:332},{bpxId:333},{bpxId:334},{bpxId:335},{bpxId:336},{bpxId:337},{bpxId:338},{bpxId:339},{bpxId:340},{bpxId:341},{bpxId:342},{bpxId:343},{bpxId:344},{bpxId:345},{bpxId:346},{bpxId:347},{bpxId:348},{bpxId:349},{bpxId:350},{bpxId:351},{bpxId:352},{bpxId:353},{bpxId:736},{bpxId:737},{bpxId:738},{bpxId:739},{bpxId:740},{bpxId:741},{bpxId:742},{bpxId:743},{bpxId:744},{bpxId:745},{bpxId:746},{bpxId:748},{bpxId:749},{bpxId:750},{bpxId:751},{bpxId:752},{bpxId:753},{bpxId:754},{bpxId:755},{bpxId:770},{bpxId:788},{bpxId:790},{bpxId:780},{bpxId:785},{bpxId:781},{bpxId:782},{bpxId:783},{bpxId:787},{bpxId:766},{bpxId:762},{bpxId:769},{bpxId:778},{bpxId:761},{bpxId:792},{bpxId:789},{bpxId:735},{bpxId:764},{bpxId:791},{bpxId:763},{bpxId:771},{bpxId:767},{bpxId:784},{bpxId:768},{bpxId:747},{bpxId:786},{bpxId:779},{bpxId:833}];

const 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我会展示到目前为止我所拥有的，但我还没有任何工作!如果我这样做就会更新。感谢您的帮助。

Answer 1

以下代码片段应该有效:

//                                        [key       , value                    ]
const parents = new Map(teams.map(team => [team.bpxId, { ...team, children: [] }]));
const lut = new Map(parents);

teamLinks.forEach(({ parentBpxTeamId, childBpxTeamId }) => {
  lut.get(parentBpxTeamId).children.push(lut.get(childBpxTeamId));
  parents.delete(childBpxTeamId);
});

const hierarchies = Array.from(parents.values());

它创建父团队层次结构的 map 和查找表，两者都使用 Map根据其 id 引用每个团队层次结构，然后循环遍历每个链接并将每个子引用附加到每个父引用。此方法假设 teamLinks 数组中没有重复的链接。

借用 Nina 的答案，当子级添加到其他团队下时，这也会将子级从层次结构的顶层删除。

const teams=[{bpxId:1},{bpxId:2},{bpxId:3},{bpxId:4},{bpxId:5},{bpxId:6},{bpxId:7},{bpxId:8},{bpxId:9},{bpxId:10},{bpxId:11},{bpxId:12},{bpxId:13},{bpxId:14},{bpxId:15},{bpxId:16},{bpxId:17},{bpxId:18},{bpxId:19},{bpxId:20},{bpxId:21},{bpxId:22},{bpxId:23},{bpxId:24},{bpxId:25},{bpxId:26},{bpxId:27},{bpxId:28},{bpxId:29},{bpxId:30},{bpxId:31},{bpxId:32},{bpxId:33},{bpxId:34},{bpxId:35},{bpxId:36},{bpxId:37},{bpxId:38},{bpxId:39},{bpxId:40},{bpxId:41},{bpxId:42},{bpxId:43},{bpxId:44},{bpxId:45},{bpxId:46},{bpxId:47},{bpxId:48},{bpxId:49},{bpxId:50},{bpxId:51},{bpxId:52},{bpxId:53},{bpxId:54},{bpxId:55},{bpxId:56},{bpxId:57},{bpxId:58},{bpxId:59},{bpxId:60},{bpxId:61},{bpxId:62},{bpxId:63},{bpxId:64},{bpxId:65},{bpxId:66},{bpxId:67},{bpxId:68},{bpxId:69},{bpxId:70},{bpxId:71},{bpxId:72},{bpxId:73},{bpxId:74},{bpxId:75},{bpxId:76},{bpxId:77},{bpxId:78},{bpxId:79},{bpxId:80},{bpxId:81},{bpxId:82},{bpxId:83},{bpxId:84},{bpxId:85},{bpxId:86},{bpxId:87},{bpxId:88},{bpxId:89},{bpxId:90},{bpxId:91},{bpxId:92},{bpxId:93},{bpxId:94},{bpxId:95},{bpxId:96},{bpxId:97},{bpxId:98},{bpxId:99},{bpxId:100},{bpxId:101},{bpxId:102},{bpxId:103},{bpxId:104},{bpxId:105},{bpxId:106},{bpxId:107},{bpxId:108},{bpxId:109},{bpxId:110},{bpxId:111},{bpxId:112},{bpxId:113},{bpxId:114},{bpxId:115},{bpxId:116},{bpxId:117},{bpxId:118},{bpxId:119},{bpxId:120},{bpxId:121},{bpxId:122},{bpxId:123},{bpxId:124},{bpxId:125},{bpxId:126},{bpxId:127},{bpxId:128},{bpxId:129},{bpxId:130},{bpxId:131},{bpxId:132},{bpxId:133},{bpxId:134},{bpxId:135},{bpxId:136},{bpxId:137},{bpxId:138},{bpxId:139},{bpxId:140},{bpxId:141},{bpxId:142},{bpxId:143},{bpxId:144},{bpxId:145},{bpxId:146},{bpxId:147},{bpxId:148},{bpxId:149},{bpxId:150},{bpxId:151},{bpxId:152},{bpxId:153},{bpxId:154},{bpxId:155},{bpxId:156},{bpxId:157},{bpxId:158},{bpxId:159},{bpxId:160},{bpxId:161},{bpxId:162},{bpxId:163},{bpxId:164},{bpxId:165},{bpxId:166},{bpxId:167},{bpxId:168},{bpxId:169},{bpxId:170},{bpxId:171},{bpxId:172},{bpxId:173},{bpxId:174},{bpxId:175},{bpxId:176},{bpxId:177},{bpxId:178},{bpxId:179},{bpxId:180},{bpxId:181},{bpxId:182},{bpxId:183},{bpxId:184},{bpxId:185},{bpxId:186},{bpxId:187},{bpxId:188},{bpxId:189},{bpxId:190},{bpxId:191},{bpxId:192},{bpxId:193},{bpxId:194},{bpxId:195},{bpxId:196},{bpxId:197},{bpxId:198},{bpxId:199},{bpxId:200},{bpxId:201},{bpxId:202},{bpxId:203},{bpxId:204},{bpxId:205},{bpxId:206},{bpxId:207},{bpxId:208},{bpxId:209},{bpxId:210},{bpxId:211},{bpxId:212},{bpxId:213},{bpxId:214},{bpxId:215},{bpxId:216},{bpxId:217},{bpxId:218},{bpxId:219},{bpxId:220},{bpxId:221},{bpxId:222},{bpxId:223},{bpxId:224},{bpxId:225},{bpxId:226},{bpxId:227},{bpxId:228},{bpxId:229},{bpxId:230},{bpxId:231},{bpxId:232},{bpxId:233},{bpxId:234},{bpxId:235},{bpxId:236},{bpxId:237},{bpxId:238},{bpxId:239},{bpxId:240},{bpxId:241},{bpxId:242},{bpxId:243},{bpxId:244},{bpxId:245},{bpxId:246},{bpxId:247},{bpxId:248},{bpxId:249},{bpxId:250},{bpxId:251},{bpxId:252},{bpxId:253},{bpxId:254},{bpxId:255},{bpxId:256},{bpxId:257},{bpxId:258},{bpxId:259},{bpxId:260},{bpxId:261},{bpxId:262},{bpxId:263},{bpxId:264},{bpxId:265},{bpxId:266},{bpxId:267},{bpxId:268},{bpxId:269},{bpxId:270},{bpxId:271},{bpxId:272},{bpxId:273},{bpxId:274},{bpxId:275},{bpxId:276},{bpxId:277},{bpxId:278},{bpxId:279},{bpxId:280},{bpxId:281},{bpxId:282},{bpxId:283},{bpxId:284},{bpxId:285},{bpxId:286},{bpxId:287},{bpxId:288},{bpxId:289},{bpxId:290},{bpxId:291},{bpxId:292},{bpxId:293},{bpxId:294},{bpxId:295},{bpxId:296},{bpxId:297},{bpxId:298},{bpxId:299},{bpxId:300},{bpxId:301},{bpxId:302},{bpxId:303},{bpxId:304},{bpxId:305},{bpxId:306},{bpxId:307},{bpxId:308},{bpxId:309},{bpxId:310},{bpxId:311},{bpxId:312},{bpxId:313},{bpxId:314},{bpxId:315},{bpxId:316},{bpxId:317},{bpxId:318},{bpxId:319},{bpxId:320},{bpxId:321},{bpxId:322},{bpxId:323},{bpxId:324},{bpxId:325},{bpxId:326},{bpxId:327},{bpxId:328},{bpxId:329},{bpxId:330},{bpxId:331},{bpxId:332},{bpxId:333},{bpxId:334},{bpxId:335},{bpxId:336},{bpxId:337},{bpxId:338},{bpxId:339},{bpxId:340},{bpxId:341},{bpxId:342},{bpxId:343},{bpxId:344},{bpxId:345},{bpxId:346},{bpxId:347},{bpxId:348},{bpxId:349},{bpxId:350},{bpxId:351},{bpxId:352},{bpxId:353},{bpxId:736},{bpxId:737},{bpxId:738},{bpxId:739},{bpxId:740},{bpxId:741},{bpxId:742},{bpxId:743},{bpxId:744},{bpxId:745},{bpxId:746},{bpxId:748},{bpxId:749},{bpxId:750},{bpxId:751},{bpxId:752},{bpxId:753},{bpxId:754},{bpxId:755},{bpxId:770},{bpxId:788},{bpxId:790},{bpxId:780},{bpxId:785},{bpxId:781},{bpxId:782},{bpxId:783},{bpxId:787},{bpxId:766},{bpxId:762},{bpxId:769},{bpxId:778},{bpxId:761},{bpxId:792},{bpxId:789},{bpxId:735},{bpxId:764},{bpxId:791},{bpxId:763},{bpxId:771},{bpxId:767},{bpxId:784},{bpxId:768},{bpxId:747},{bpxId:786},{bpxId:779},{bpxId:833}];

const teamLinks=[{parentBpxTeamId:1,childBpxTeamId:2},{parentBpxTeamId:1,childBpxTeamId:11},{parentBpxTeamId:1,childBpxTeamId:91},{parentBpxTeamId:1,childBpxTeamId:270},{parentBpxTeamId:2,childBpxTeamId:3},{parentBpxTeamId:3,childBpxTeamId:4},{parentBpxTeamId:3,childBpxTeamId:5},{parentBpxTeamId:3,childBpxTeamId:6},{parentBpxTeamId:3,childBpxTeamId:7},{parentBpxTeamId:3,childBpxTeamId:8},{parentBpxTeamId:3,childBpxTeamId:9},{parentBpxTeamId:3,childBpxTeamId:10},{parentBpxTeamId:3,childBpxTeamId:92},{parentBpxTeamId:11,childBpxTeamId:12},{parentBpxTeamId:12,childBpxTeamId:13},{parentBpxTeamId:14,childBpxTeamId:15},{parentBpxTeamId:14,childBpxTeamId:24},{parentBpxTeamId:14,childBpxTeamId:38},{parentBpxTeamId:14,childBpxTeamId:54},{parentBpxTeamId:14,childBpxTeamId:62},{parentBpxTeamId:14,childBpxTeamId:69},{parentBpxTeamId:14,childBpxTeamId:73},{parentBpxTeamId:14,childBpxTeamId:76},{parentBpxTeamId:14,childBpxTeamId:88},{parentBpxTeamId:15,childBpxTeamId:16},{parentBpxTeamId:16,childBpxTeamId:17},{parentBpxTeamId:16,childBpxTeamId:18},{parentBpxTeamId:16,childBpxTeamId:19},{parentBpxTeamId:16,childBpxTeamId:20},{parentBpxTeamId:16,childBpxTeamId:21},{parentBpxTeamId:16,childBpxTeamId:22},{parentBpxTeamId:16,childBpxTeamId:23},{parentBpxTeamId:24,childBpxTeamId:25},{parentBpxTeamId:25,childBpxTeamId:26},{parentBpxTeamId:25,childBpxTeamId:27},{parentBpxTeamId:25,childBpxTeamId:28},{parentBpxTeamId:25,childBpxTeamId:29},{parentBpxTeamId:25,childBpxTeamId:30},{parentBpxTeamId:25,childBpxTeamId:31},{parentBpxTeamId:25,childBpxTeamId:32},{parentBpxTeamId:25,childBpxTeamId:33},{parentBpxTeamId:25,childBpxTeamId:34},{parentBpxTeamId:25,childBpxTeamId:35},{parentBpxTeamId:25,childBpxTeamId:36},{parentBpxTeamId:25,childBpxTeamId:37},{parentBpxTeamId:38,childBpxTeamId:39},{parentBpxTeamId:39,childBpxTeamId:40},{parentBpxTeamId:39,childBpxTeamId:41},{parentBpxTeamId:39,childBpxTeamId:42},{parentBpxTeamId:39,childBpxTeamId:43},{parentBpxTeamId:39,childBpxTeamId:44},{parentBpxTeamId:39,childBpxTeamId:45},{parentBpxTeamId:39,childBpxTeamId:46},{parentBpxTeamId:39,childBpxTeamId:47},{parentBpxTeamId:39,childBpxTeamId:48},{parentBpxTeamId:39,childBpxTeamId:49},{parentBpxTeamId:39,childBpxTeamId:50},{parentBpxTeamId:39,childBpxTeamId:51},{parentBpxTeamId:39,childBpxTeamId:52},{parentBpxTeamId:39,childBpxTeamId:53},{parentBpxTeamId:54,childBpxTeamId:55},{parentBpxTeamId:55,childBpxTeamId:56},{parentBpxTeamId:55,childBpxTeamId:57},{parentBpxTeamId:55,childBpxTeamId:58},{parentBpxTeamId:55,childBpxTeamId:59},{parentBpxTeamId:55,childBpxTeamId:60},{parentBpxTeamId:55,childBpxTeamId:61},{parentBpxTeamId:62,childBpxTeamId:63},{parentBpxTeamId:63,childBpxTeamId:64},{parentBpxTeamId:63,childBpxTeamId:65},{parentBpxTeamId:63,childBpxTeamId:66},{parentBpxTeamId:63,childBpxTeamId:67},{parentBpxTeamId:63,childBpxTeamId:68},{parentBpxTeamId:69,childBpxTeamId:70},{parentBpxTeamId:69,childBpxTeamId:71},{parentBpxTeamId:71,childBpxTeamId:72},{parentBpxTeamId:73,childBpxTeamId:74},{parentBpxTeamId:74,childBpxTeamId:75},{parentBpxTeamId:76,childBpxTeamId:77},{parentBpxTeamId:77,childBpxTeamId:78},{parentBpxTeamId:77,childBpxTeamId:79},{parentBpxTeamId:77,childBpxTeamId:80},{parentBpxTeamId:77,childBpxTeamId:81},{parentBpxTeamId:77,childBpxTeamId:82},{parentBpxTeamId:77,childBpxTeamId:83},{parentBpxTeamId:77,childBpxTeamId:84},{parentBpxTeamId:77,childBpxTeamId:85},{parentBpxTeamId:77,childBpxTeamId:86},{parentBpxTeamId:77,childBpxTeamId:87},{parentBpxTeamId:88,childBpxTeamId:89},{parentBpxTeamId:89,childBpxTeamId:90},{parentBpxTeamId:91,childBpxTeamId:3},{parentBpxTeamId:93,childBpxTeamId:94},{parentBpxTeamId:93,childBpxTeamId:97},{parentBpxTeamId:93,childBpxTeamId:100},{parentBpxTeamId:93,childBpxTeamId:103},{parentBpxTeamId:93,childBpxTeamId:104},{parentBpxTeamId:93,childBpxTeamId:106},{parentBpxTeamId:93,childBpxTeamId:109},{parentBpxTeamId:93,childBpxTeamId:112},{parentBpxTeamId:93,childBpxTeamId:115},{parentBpxTeamId:94,childBpxTeamId:95},{parentBpxTeamId:95,childBpxTeamId:96},{parentBpxTeamId:95,childBpxTeamId:98},{parentBpxTeamId:95,childBpxTeamId:99},{parentBpxTeamId:97,childBpxTeamId:95},{parentBpxTeamId:100,childBpxTeamId:101},{parentBpxTeamId:101,childBpxTeamId:102},{parentBpxTeamId:101,childBpxTeamId:105},{parentBpxTeamId:103,childBpxTeamId:101},{parentBpxTeamId:104,childBpxTeamId:101},{parentBpxTeamId:106,childBpxTeamId:107},{parentBpxTeamId:107,childBpxTeamId:108},{parentBpxTeamId:109,childBpxTeamId:110},{parentBpxTeamId:110,childBpxTeamId:111},{parentBpxTeamId:112,childBpxTeamId:113},{parentBpxTeamId:113,childBpxTeamId:114},{parentBpxTeamId:115,childBpxTeamId:116},{parentBpxTeamId:116,childBpxTeamId:117},{parentBpxTeamId:118,childBpxTeamId:119},{parentBpxTeamId:119,childBpxTeamId:120},{parentBpxTeamId:121,childBpxTeamId:122},{parentBpxTeamId:121,childBpxTeamId:139},{parentBpxTeamId:121,childBpxTeamId:144},{parentBpxTeamId:122,childBpxTeamId:123},{parentBpxTeamId:122,childBpxTeamId:125},{parentBpxTeamId:122,childBpxTeamId:127},{parentB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entBpxTeamId:778,childBpxTeamId:781},{parentBpxTeamId:778,childBpxTeamId:782},{parentBpxTeamId:778,childBpxTeamId:783},{parentBpxTeamId:778,childBpxTeamId:784},{parentBpxTeamId:778,childBpxTeamId:785},{parentBpxTeamId:778,childBpxTeamId:786},{parentBpxTeamId:778,childBpxTeamId:787},{parentBpxTeamId:778,childBpxTeamId:788},{parentBpxTeamId:789,childBpxTeamId:790},{parentBpxTeamId:789,childBpxTeamId:791},{parentBpxTeamId:789,childBpxTeamId:792}];
 
const parents = new Map(teams.map(team => [team.bpxId, { ...team, children: [] }]));
const lut = new Map(parents);

teamLinks.forEach(({ parentBpxTeamId, childBpxTeamId }) => {
  lut.get(parentBpxTeamId).children.push(lut.get(childBpxTeamId));
  parents.delete(childBpxTeamId);
});

const hierarchies = Array.from(parents.values());

console.log(hierarchies);

.as-console-wrapper{min-height:100%!important}