code: public UpdateFunctionConfigurationResult withLayers(Layer... layers) {
          if (this.layers == null) {
              setLayers(new com.amazonaws.internal.SdkInternalList<Layer>(layers.length));
          }
          for (Layer ele : layers) {
              this.layers.add(ele);
          }
          return this;
      }
docs: <p>
  The function's <a href="https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html"> layers</a>.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setLayers(java.util.Collection)} or {@link #withLayers(java.util.Collection)} if you want to override the
  existing values.
  </p>
  
  @param layers
  The function's <a href="https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html">
  layers</a>.
  @return Returns a reference to this object so that method calls can be chained together.