tree functions

forEach.js

function walkTree(onEachChildren, childrenKey = "children") {
  return function treeWalker(elem, level = 0) {
    onEachChildren(elem, level);
    if (elem[childrenKey]) {
      elem[childrenKey].forEach(item => treeWalker(item, level + 1));
    }
  };
}

// how to use
const renderTree = walkTree((elem, level) => {
  console.log(elem.name.padStart(level + elem.name.length, "  "));
});

renderTree(tree)