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const traversal = (tree, fn) => {

let queue = [].concat(tree);

while (queue.length) {

let node = queue.shift();

fn(node);

const nodeBody = node.children;

if (nodeBody) {

queue = [...queue, ...nodeBody];

}

}

};

const traversalSearch = (tree, fn) => {

const result = [];

traversal(tree, node => {

if (fn(node)) {

result.push(node);

}

});

return result;

};

module.exports = {

traversal,

traversalSearch

};