The following HTML represents a family tree:


Implement the closestRelative function so that when a parent HTML element is passed, the function returns the parent's closest relative whose name matches the relativeName, and obeys the following rules:

  • The parent parameter is the HTML element of which the closest relative will be a descendant.
  • Each member of the family, including children, may also be a parent to one or more children.
  • Children are more closely related to the parent than grandchildren.
  • If several children in the same generation have the same name, then the first child in the tree is considered the closer relative.
  • If no matching relative is found the function should return null.

For example, the below code should print 'MIKE' for the given family tree:

let parent = document.getElementsByTagName('James')[0];
let relative = closestRelative(parent, 'Mike');
console.log(relative && relative.tagName); // prints MIKE

  •   Example case: TypeError
  •   Several generations: TypeError
  •   Children with the same name: TypeError

JavaScript Recursion Selectors New Public


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