Javascript group by array of objects (complicated objects)

Question

After a lot of tries and search, I couldn't solve my following problem:
I have the following array

[
{text: "text", title: "title", cid: "cid", active: true, nodes: [
  {title: "subTitle", text: "subText", cid: "cid", active: true, nodes: [
    {text:"123", title:"321"}, 
    {text:"456", title:"654"},
    {text:"789", title:"765"}
  ]},
   {title: "subTitle", text: "subText2", cid: "cid2", active: true, nodes: [
    {text:"testText", title:"testTitle1"}, 
    {text:"testText", title:"testTitle2"},
    {text:"testText", title:"testTitle3"}
  ]},
  {title: "subTitle", text: "subText3", cid: "cid3", active: true, nodes: [
    {text:"ycycy", title:"asd"}, 
    {text:"nyd", title:"yf"},
    {text:"xfg", title:"qq"}
  ]},
  {title: "anotherSubTitle", text: "subText4", cid: "cid4", active: true, nodes: [
    {text:"fff", title:"hhh"}, 
    {text:"xxx", title:"sss"},
    {text:"hhh", title:"jjj"}
  ]}
]}
]

I want to reach the following format:

[
{text: "text", title: "title", cid: "cid", active: true, nodes: [
  {title: "subTitle", text: "subText", cid: "cid", active: true, nodes: [
    {text:"123", title:"321"}, 
    {text:"456", title:"654"},
    {text:"789", title:"765"},
    {text:"testText", title:"testTitle1"},
    {text:"testText", title:"testTitle1"},
    {text:"testText", title:"testTitle1"},
    {text:"ycycy", title:"asd"}, 
    {text:"nyd", title:"yf"},
    {text:"xfg", title:"qq"}
  ]},
  {title: "anotherSubTitle", text: "subText4", cid: "cid4", active: true, nodes: [
    {text:"fff", title:"hhh"}, 
    {text:"xxx", title:"sss"},
    {text:"hhh", title:"jjj"}
  ]}
]}
]

I tried array.reduce and to loop through the array but each time I got a wrong result...
Any suggestion plz?

It doesn't look like there's any "grouping" going on in the traditional sense. Just moving all of the elements in the nodes array of the second level elements into the first element's nodes array. — Heretic Monkey
– Heretic Monkey, Commented Dec 18, 2020 at 17:28
Does this answer your question? How to merge/concatenate values of same object properties in an array of objects using lodash? — Heretic Monkey
– Heretic Monkey, Commented Dec 18, 2020 at 17:32
Unfortunately no answer could help... Actually I am trying to group by text in the nodes in the first level. — Gothiquo
– Gothiquo, Commented Dec 18, 2020 at 17:37

Nina Scholz · Accepted Answer · 2020-12-18 17:43:53Z

You could take a nested grouping by a property for all levels.

const
    groupBy = (array, key) => array.reduce((r, { nodes, ...o }) => {
        let temp = r.find(q => q[key] === o[key]);
        if (!temp) r.push(temp = o);
        if (nodes) (temp.nodes ??= []).push(...groupBy(nodes, key));
        return r;
    }, []),
    data = [{ text: "text", title: "title", cid: "cid", active: true, nodes: [{ title: "subTitle", text: "subText", cid: "cid", active: true, nodes: [{ text: "123", title: "321" }, { text: "456", title: "654" }, { text: "789", title: "765" }] }, { title: "subTitle", text: "subText2", cid: "cid2", active: true, nodes: [{ text: "testText", title: "testTitle1" }, { text: "testText", title: "testTitle2" }, { text: "testText", title: "testTitle3" }] }, { title: "subTitle", text: "subText3", cid: "cid3", active: true, nodes: [{ text: "ycycy", title: "asd" }, { text: "nyd", title: "yf" }, { text: "xfg", title: "qq" }] }] }],
    result = groupBy(data, 'title');

console.log(result);

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