code: function last(predicate, defaultValue) {
    predicate = typeof predicate === 'function' ? predicate : util.defaultPredicate;
  
    let lastValue;
    let found = false;
    for (let item of this.where(predicate)) {
      lastValue = item;
      found = true;
    }
  
    return found ? lastValue : defaultValue;
  }
docs: Returns the last element of a sequence that satisfies a condition or a default value if no such element is found.
  
  @param predicate A function to test each element for a condition.
  @param defaultValue The default value if no such element is found.
  @return Default value if the sequence is empty or if no elements pass the test in the predicate function; otherwise, the last element that passes the test in the predicate function.