// (m[key]) from the map. If m is nil or there is no such element, delete
// is a no-op.
func delete(m map[Type]Type1, key Type)

// The len built-in function returns the length of v, according to its type:
//
//   - Array: the number of elements in v.
//   - Pointer to array: the number of elements in *v (even if v is nil).
//   - Slice, or map: the number of elements in v; if v is nil, len(v) is zero.

     * Merges response data from the crawler into the original data map.
     * Handles special ".overwrite" suffix fields by removing the suffix and overwriting the base field.
     *
     * @param dataMap the original data map to merge into
     * @param responseDataMap the response data map from the crawler
     */
    protected void mergeResponseData(final Map<String, Object> dataMap, final Map<String, Object> responseDataMap) {

        .addEqualityGroup(Functions.forMap(map))
        .addEqualityGroup(Functions.forMap(map, null))
        .addEqualityGroup(Functions.forMap(map, 43))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testForMapWithDefault_includeSerializable() {
    Map<String, Integer> map = new HashMap<>();
    map.put("One", 1);
    map.put("Three", 3);

                    } else if (value instanceof Map) {
                        // Handle nested maps
                        handleNestedMap(result, key, (Map<String, Object>) value);
                        // For simplicity in test, just handle one level
                        Map<String, Object> nestedMap = (Map<String, Object>) value;
                        for (Map.Entry<String, Object> nestedEntry : nestedMap.entrySet()) {

    }

    class Builder {
        private Map<String, String> userProperties;
        private Map<String, String> systemProperties;
        private Instant startTime;
        private Path topDirectory;
        private Path rootDirectory;

        private Builder() {}

        private Builder(
                Map<String, String> userProperties,
                Map<String, String> systemProperties,

  private final ImmutableMap<K, V> map;

  ImmutableMapKeySet(ImmutableMap<K, V> map) {
    this.map = map;
  }

  @Override
  public int size() {
    return map.size();
  }

  @Override
  public UnmodifiableIterator<K> iterator() {
    return map.keyIterator();
  }

  @Override
  public boolean contains(@Nullable Object object) {
    return map.containsKey(object);
  }

  @Override

    //                                                                              Source
    //                                                                              ======
    @Override
    public Map<String, Object> toSource() {
        Map<String, Object> sourceMap = new HashMap<>();
        if (boostExpr != null) {
            addFieldToSource(sourceMap, "boostExpr", boostExpr);
        }
        if (createdBy != null) {

    /**
     * Get the environment map.
     * @return The environment map.
     */
    protected Map<String, String> getEnvMap() {
        if (envMap != null) {
            return envMap;
        }
        return System.getenv();
    }

    /**
     * Set the environment map.
     * @param envMap The environment map.
     */
    public void setEnvMap(final Map<String, String> envMap) {

  }

  public void testCreateFromMap() {
    /* Test with non-empty Map. */
    Map<Currency, Country> map =
        ImmutableMap.of(
            Currency.DOLLAR, Country.CANADA,
            Currency.PESO, Country.CHILE,
            Currency.FRANC, Country.SWITZERLAND);
    EnumBiMap<Currency, Country> bimap = EnumBiMap.create(map);
    assertEquals(Country.CANADA, bimap.get(Currency.DOLLAR));

      Map<K, ? extends V> map, @ParametricNullness V defaultValue) {
    return new ForMapWithDefault<>(map, defaultValue);
  }

  private static final class FunctionForMapNoDefault<
          K extends @Nullable Object, V extends @Nullable Object>
      implements Function<K, V>, Serializable {
    final Map<K, V> map;

    FunctionForMapNoDefault(Map<K, V> map) {
      this.map = checkNotNull(map);
    }

    @Override