* Double#NEGATIVE_INFINITY}, or {@link Double#NaN}) then the result is {@link Double#NaN}.
   *
   * @throws IllegalStateException if the dataset is empty
   */
  public double populationCovariance() {
    checkState(count() != 0);
    return sumOfProductsOfDeltas / count();
  }

  /**

        return input;
    }

    /**
     * Gets the value of the stopword.
     *
     * @return The stopword value, or an empty string if null.
     */
    public String getInputValue() {
        if (input == null) {
            return StringUtil.EMPTY;
        }
        return input;
    }

    /**
     * Checks if the item has been updated.
     *

   * incoming edges.
   */
  private Set<N> predecessorsOrEmpty(N node) {
    if (edgeType == EdgeType.INCOMING || edgeType == EdgeType.BOTH) {
      return graph.predecessors(node);
    } else {
      return ImmutableSet.of();
    }
  }

  /**
   * Returns the successors of the given node, or an empty set if this set does not represent

                               aria-controls="listSearchForm"><i class="fas fa-search" aria-hidden="true"></i></a>
                            <div class="collapse <c:if test="${!empty urlExpr || !empty boostExpr}">show</c:if>" id="listSearchForm">
                                <la:form action="/admin/boostdoc/">
                                    <div class="form-group row">

     * track the problem back to its origin. A concrete example for such a source hint can be the file path or URL from
     * which a POM was read.
     *
     * @return The hint about the source of the problem or an empty string if unknown, never {@code null}.
     */
    String getSource();

    /**
     * Gets the one-based index of the line containing the problem. The line number should refer to some text file that

            return StringUtil.EMPTY;
        }
        // Remove trailing slash if present
        String name = objectName;
        if (name.endsWith("/")) {
            name = name.substring(0, name.length() - 1);
        }
        final String[] values = name.split("/");
        if (values.length == 0) {
            return StringUtil.EMPTY;
        }
        return values[values.length - 1];

        assertEquals("secret", new String(pc.getPassword()));
    }

    @Test
    @DisplayName("handle: empty user/domain edge yields '@' and null password")
    void testHandleWithEmptyUserAndDomainEdge() throws Exception {
        // Default constructor results in empty strings for user and domain, null for password
        JAASAuthenticator auth = new JAASAuthenticator();

					arg3="${f:h(currentEndRecordNumber)}" />
			</c:if>
			<c:if test="${execTime!=null}">
				<la:message key="labels.search_result_time" arg0="${f:h(execTime)}" />
			</c:if>
		</p>
		<c:if test="${! empty sdh }">
		<p>
			<la:message key="labels.similar_doc_result_status" />
		</p>
		</c:if>
	</div>
</div>
<c:if test="${partialResults}">
	<div class="alert">
		<p>

    hashingSink.buffer().use {
      this.writeTo(it)
    }
    return hashingSink.hash
  }

  companion object {
    /** Empty request body with no content-type. */
    @JvmField
    val EMPTY: RequestBody = ByteString.EMPTY.toRequestBody()

    /**
     * Returns a new request body that transmits this string. If [contentType] is non-null and lacks
     * a charset, this will use UTF-8.

     * @return the cleaned value at the specified index, or empty string if index is out of bounds
     */
    static String getValue(final List<String> list, final int index) {
        if (index >= list.size()) {
            return StringUtil.EMPTY;
        }
        String item = list.get(index).trim();
        if (StringUtil.isBlank(item)) {
            return StringUtil.EMPTY;
        }