Test Getting Tree Data in flattened Array

test.js

class Tree {
  constructor(name) {
    this.name = name;
    this.children = [];
  }
  append(item) {
    this.children.push(item);
  }
  getDescendantNames() {
    return this.children.reduce((names, item) => {
      return names.concat(item.getDescendantNames());
    }, [this.name]);
  }
}

`
Root
  Foo
    Bar
    Bar2
  Foo2
    Bar3
      Baz
  Foo3
`

let root = new Tree('Root');

let foo = new Tree('Foo');
foo.append(new Tree('Bar'));
foo.append(new Tree('Bar2'));
root.append(foo);

let foo2 = new Tree('Foo2');
let bar3 = new Tree('Bar3');
let baz = new Tree('Baz');
bar3.append(baz);
foo2.append(bar3);
root.append(foo2);

let foo3 = new Tree('Foo3');
root.append(foo3);

let names = root.getDescendantNames();
console.log(names);