text: const { NotImplementedError } = require('../extensions/index.js');
  
  /**
   * Given a singly linked list of integers l and an integer k,
   * remove all elements from list l that have a value equal to k.
   *
   * @param {List} l
   * @param {Number} k
   * @return {List}
   *
   * @example
   * For l = [3, 1, 2, 3, 4, 5] and k = 3,
   * the output should be [1, 2, 4, 5]
   *
   * Singly - linked lists are already defined with this interface
   * function ListNode(x) {
   *   this.value = x;
   *   this.next = null;
   * }
   */
  
  module.exports = function removeKFromList(l, k) {
      // throw new NotImplementedError('Not implemented');
      let head = l
      let previous = null
  
      while (l) {
          if (l.value === k) {
              if (previous === null) {
                  head = l.next
  
              } else {
                  previous.next = l.next
                  l = l.next
  
              }
          }
          previous = l
          l = l.next
      }
      return head
  }