极速阅览

Write a function createTree that creates a nested ul/li list from the nested object.

For instance:

          let data = {
  "Fish": {
    "trout": {},
    "salmon": {}
  },

  "Tree": {
    "Huge": {
      "sequoia": {},
      "oak": {}
    },
    "Flowering": {
      "apple tree": {},
      "magnolia": {}
    }
  }
};
        

The syntax:

          let container = document.getElementById('container');
createTree(container, data); // creates the tree in the container
        

The result (tree) should look like this:

Choose one of two ways of solving this task:

Create the HTML for the tree and then assign to container.innerHTML.
Create tree nodes and append with DOM methods.

Would be great if you could do both.

P.S. The tree should not have “extra” elements like empty <ul></ul> for the leaves.

Open a sandbox for the task.

solution

The easiest way to walk the object is to use recursion.

The solution with innerHTML.
The solution with DOM.

Create a tree from the object