Given an object and a key, write a function "getLastElementOfProperty" returns the last element of an array located at the given key.

getLastElementOfProperty

Notes:
* If the array is empty, it should return undefined.
* if the property at the given key is not an array, it should return undefined.
* If there is no property at the key, it should return undefined.



function getLastElementOfProperty(obj, key) {
  // your code here
   if ( Array.isArray( obj[key] ) === false ){
      return undefined;
    }else if ( obj[key][0] === undefined){
      return undefined;
    }else{
      return obj[key][obj[key].length - 1];
    }

}