Node JS add children properties to JSON - node.js

Question

I have 2 Json ARRAY listA and listB want to add listB items into listA based on id's issue_id and descendents_parent_issue_id
const listA = [
{
"issue_id": 2,
"name": 'A',
},
{
"issue_id": 1,
"name": 'B',
},
{
"issue_id": 3,
"name": 'C'
},
{
"issue_id": 4,
"name": 'D',
}
];
const listB = [{
"descendents_issue_id": 7,
"descendents_parent_issue_id": 2,
"issue": "Breakdown",
},{
"descendents_issue_id": 881,
"descendents_parent_issue_id": 7,
"issue": "Hydraulic arm failure"
},{
"descendents_issue_id": 8,
"descendents_parent_issue_id": 2,
"descendents_issue": "Setup/ Changeover"
},{
"descendents_issue_id": 942,
"descendents_parent_issue_id": 7,
"descendents_issue": "Pump Overload"
}];
Expected output:
[
{
"issue_id": 2,
"name": "A",
"children": [
{
"descendents_issue_id": 7,
"descendents_parent_issue_id": 2,
"issue": "Breakdown",
"children": [
{
"descendents_issue_id": 881,
"descendents_parent_issue_id": 7,
"issue": "Hydraulic arm failure"
},
{
"descendents_issue_id": 942,
"descendents_parent_issue_id": 7,
"descendents_issue": "Pump Overload"
}
]
},
{
"descendents_issue_id": 8,
"descendents_parent_issue_id": 2,
"descendents_issue": "Setup/ Changeover"
}
]
},
{
"issue_id": 1,
"name": "B"
},
{
"issue_id": 3,
"name": "C"
},
{
"issue_id": 4,
"name": "D"
}
]
tried this following code not getting the expected output
function processIssues(arr, arrayB) {
return arr.reduce((result, item) => {
const itemInB = arrayB.find(itemB => itemB.descendents_parent_issue_id == item.issue_id);
if (itemInB) {
let child = [];
child.push(itemInB);
item.children = child
}
return [...result, item];
}, []);
}
Getting Output
[
{
"issue_id": 2,
"name": "A",
"children": [
{
"descendents_issue_id": 7,
"descendents_parent_issue_id": 2,
"issue": "Breakdown"
}
]
},
{
"issue_id": 1,
"name": "B"
},
{
"issue_id": 3,
"name": "C"
},
{
"issue_id": 4,
"name": "D"
}
]
when I tried recursion getting maximum call stack exceeded. please help

Answer 1

I think you should parse the items for the first array and try to scan the second array matching items with issue_id:
const processIssues = (arr, arrB) => {
let found;
return arr.map(({ issue_id, children = [], ...rest }) => {
found = arrB.find(
({ descendents_parent_issue_id }) =>
descendents_parent_issue_id === issue_id
);
return found
? { issue_id, children: [...children, { ...found }], ...rest }
: { issue_id, ...rest };
});
};