convert array to BST - binary search tree

array_to_bst.js

const arrayToBst = arr => {
  const [LEFT, VALUE, RIGHT] = [0, 1, 2];
  const node = [null, null, null] 
  const bst = node.slice();
  arr.map(el => {
    let tmp = bst;
    while (tmp[VALUE] !== null) {
      const branch = el < tmp[VALUE] ? LEFT : RIGHT;
      if (tmp[branch] === null) {
        tmp[branch] = node.slice();
      }
      tmp = tmp[branch];
    }
    tmp[VALUE] = el;
  });
  return bst;
};