code: public DescribeUserProfilesRequest withIamUserArns(String... iamUserArns) {
          if (this.iamUserArns == null) {
              setIamUserArns(new com.amazonaws.internal.SdkInternalList<String>(iamUserArns.length));
          }
          for (String ele : iamUserArns) {
              this.iamUserArns.add(ele);
          }
          return this;
      }
docs: <p>
  An array of IAM or federated user ARNs that identify the users to be described.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setIamUserArns(java.util.Collection)} or {@link #withIamUserArns(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param iamUserArns
  An array of IAM or federated user ARNs that identify the users to be described.
  @return Returns a reference to this object so that method calls can be chained together.