code: public AttributeValue withNS(String... nS) {
          if (this.nS == null) {
              setNS(new java.util.ArrayList<String>(nS.length));
          }
          for (String ele : nS) {
              this.nS.add(ele);
          }
          return this;
      }
docs: <p>
  An attribute of type Number Set. For example:
  </p>
  <p>
  <code>"NS": ["42.2", "-19", "7.5", "3.14"]</code>
  </p>
  <p>
  Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and
  libraries. However, DynamoDB treats them as number type attributes for mathematical operations.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setNS(java.util.Collection)} or {@link #withNS(java.util.Collection)} if you want to override the
  existing values.
  </p>
  
  @param nS
  An attribute of type Number Set. For example:</p>
  <p>
  <code>"NS": ["42.2", "-19", "7.5", "3.14"]</code>
  </p>
  <p>
  Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and
  libraries. However, DynamoDB treats them as number type attributes for mathematical operations.
  @return Returns a reference to this object so that method calls can be chained together.