Deep Flatten JavaScript Object Recursively

Question

Data:

var data = [
    {
      \"id\": 1,
      \"level\": \"1\",
      \"text\": \"Sammy\",
      \"type\": \"Item\",
      \"items\": [
               


        

Answer 1

Modified Роман Парадеев answer to make it somewhat more dynamic.

function flatten(xs, childSelector) {
  return xs.reduce((acc, x) => {
    acc = acc.concat(x);
    let children = childSelector(x);
    if (children) {
      acc = acc.concat(flatten(children, childSelector));
    }
    return acc;
  }, []);
}

Now items is not hardcoded, and you can use it flatten(data, x => x.items).