code: public DeleteUserAttributesRequest withUserAttributeNames(String... userAttributeNames) {
          if (this.userAttributeNames == null) {
              setUserAttributeNames(new java.util.ArrayList<String>(userAttributeNames.length));
          }
          for (String ele : userAttributeNames) {
              this.userAttributeNames.add(ele);
          }
          return this;
      }
docs: <p>
  An array of strings representing the user attribute names you wish to delete.
  </p>
  <p>
  For custom attributes, you must prepend the <code>custom:</code> prefix to the attribute name.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUserAttributeNames(java.util.Collection)} or {@link #withUserAttributeNames(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param userAttributeNames
  An array of strings representing the user attribute names you wish to delete.</p>
  <p>
  For custom attributes, you must prepend the <code>custom:</code> prefix to the attribute name.
  @return Returns a reference to this object so that method calls can be chained together.