code: @javax.annotation.Nonnull
    public static double[] sum(@javax.annotation.Nonnull final double[] a, final double b) {
      return com.simiacryptus.util.ArrayUtil.op(a, (x) -> x + b);
    }
docs: Sum double [ ].
  
  @param a the a
  @param b the b
  @return the double [ ]