Build one object by using array of objects (recursively with subobjects)

Question

Maybe someone can help here.

What I want to do is:

• Build one result obj that consists of all the attributes / subobjects of all of these objects in the array
• Always have only arrays in the result obj
• Recursively build this object (as I don't know how many levels there could be and I don't know the names of the objects)
• The order of the attributes is not relevant
• Managable Except / black list for some attributes (such as id)

const arr = [{
 id: 0,
 nickname: 'Testnick 0',
 loel: {
 nice: 'like it',
 },
 rating: {
 abc: 5,
 helloworld: 2,
 },
 },
 {
 id: 1,
 nickname: 'Testnick 2',
 rating: {
 abc: 4,
 moep: 1,
 },
 },
 {
 id: 2,
 nickname: 'Testnick 3',
 rating: {
 abc: 40,
 sun: 20,
 anotherObj: {
 tr: 34,
 subsubobj: {
 sd: 24,
 },
 },
 },
 },
];

So the resultobj would look similar to this:

const result = {
 id: [0, 1, 2],
 nickname: ['Testnick 0', 'Testnick 2', 'Testnick 3'],
 loel: {
 nice: ['like it'],
 },
 rating: {
 abc: [5, 4, 40],
 helloworld: [2],
 moep: [1],
 sun: [20],
 anotherObj: {
 tr: [34],
 subsubobj: {
 sd: [24],
 },
 },
 },
};

Can someone help here?

• ASDFGerte: What have you tried so far?
• Gutelaunetyp: Using constant values to do so, but as I don't know the amount of levels and the attribute names, need to figure out another way

Answer 1

You coud reduce the given array and iterate the object's keys and values recursively for nested objects.

function setValues(target, source) {
 Object.entries(source).forEach(([k, v]) => {
 if (v && typeof v === 'object') {
 setValues(target[k] = target[k] || {}, v);
 } else {
 target[k] = target[k] || [];
 target[k].push(v);
 }
 });
 return target;
}
var data = [{ id: 0, nickname: 'Testnick 0', loel: { nice: 'like it' }, rating: { abc: 5, helloworld: 2 } }, { id: 1, nickname: 'Testnick 2', rating: { abc: 4, moep: 1 } }, { id: 2, nickname: 'Testnick 3', rating: { abc: 40, sun: 20, anotherObj: { tr: 34, subsubobj: { sd: 24 } } } }],
 result = data.reduce(setValues, {});
console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

• Gutelaunetyp: Gives me TypeError: target[k].push is not a function sometimes, need to debug. But thanks.