JavaScript: Transformer

Before taking this challenge, we recommend that you go through and analyze the teacher's solution in the "Building an itinerary" challenge.

transformer.js

Implement and export as default a function that builds a tree relative to a given root node.

The function takes 2 arguments:

• source tree
• the root node for a new tree to built

The function should return a new tree preserving links between nodes, where the passed node is the root.

Examples

const tree = ['A', [ //     A
  ['B', [            //    / \
    ['D'],           //   B   C
  ]],                //  /   / \
  ['C', [            // D   E   F
    ['E'],
    ['F'],
  ]],
]];

transform(tree, 'B');

// ['B', [           //   B
//   ['D'],          //  / \
//   ['A', [         // D   A
//     ['C', [       //      \
//       ['E'],      //       C
//       ['F'],      //      / \
//     ]],           //     E   F
//   ]],
// ]];

Tips

• Other examples can be found in the tests file
• Use the lodash lib functions