Method isNull

core/src/core/java/var3d/net/center/json/JSONArray.java:263–266

Returns true if this array has no value at index, or if its value is the null reference or JSONObject#NULL.

(int index)

     * is the {@code null} reference or {@link JSONObject#NULL}.
     */
    public boolean isNull(int index) {
        Object value = opt(index);
        return value == null || value == JSONObject.NULL;
    }

    /**
     * Returns the value at {@code index}.