Method add

src/main/java/com/amazon/ion/IonStruct.java:182–182

Adds a new field to this struct. If this is null.struct , then it becomes a single-field struct. If a field with the given name already exists in this struct, this call will result in repeated fields. @param fieldName the name of the new field. @param child the value of the new fiel

(String fieldName, IonValue child)

     *   if {@code element} is an {@link IonDatagram}.
     */
    public void add(String fieldName, IonValue child)
        throws ContainedValueException;