create node programmatically

gistfile1.txt

 /**
   * @param string $type
   * @param string $title
   * @param string $langcode
   * @param string $uid
   * @param array $fields
   * @param bool $promote
   * @param bool $status
   * @return \Drupal\node\Entity\Node $node
   */
  public function createNode ($type, $title, $langcode, $pattern ='' , $uid = '1', $fields = [], $promote = FALSE, $status = TRUE){
    // Add trailing slash to the pattern and build the path
    $pattern = empty($pattern) ? '' : $pattern . '/';
    $path = '/' . $pattern . $this->cleanAlias($title, $langcode);

    /** @var \Drupal\node\Entity\Node $node */
    $node = Node::create(array(
      'type' => $type,
      'title' => $title,
      'uid' => $uid,
      'status' => $status,
      'promote' => $promote,
      'langcode' => $langcode,
      'path' => $path,
    ));

    if (empty($fields)) {
      $node->save();
      return $node;
    }

    else {
      foreach ($fields as $field_name => $value) {
        if ($node->hasField($field_name)) {
          $node->set($field_name, $value);
        }
      }

      $node->save();
      return $node;
    }

  }