Deep Flatten JavaScript Object Recursively

Question

Data:

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


        

Answer 1

With a bit of ES6 flavor

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