Json Tutorial Pdf

We make available with database used with PHP is MYSQL – which is also an open source which is an added advantage. New in Version 2019r3: Split Text View (horizontal or vertical) JSON Schema draft-06 & 07 support; Support for additional databases. 0 JSON Schema is a powerful tool for validating the structure of JSON data. NET MVC4, it has been around for more than a year and a half. For this tutorial we are going to use v10. How to Extract Data From Json Response Using JMeter. This Core Data by Tutorials: iOS 12 and Swift 4. In this page you will learn about structures of JSON. Now you ready to go with the example. 2 Introduction to JSON. NET type objects into JSON-encoded data and then deserialize data in the JSON. JSON (JavaScript Object Notation) is a lightweight, text-based, language-independent data exchange format that is easy for humans and machines to read and write. The starting point is a package. org interactive JavaScript tutorial. Prototype 1. This tutorial illustrates the most common Jackson 2 tasks, problems and solutions while marshalling and unmarshalling JSON. JSON is a text format and it is completely language independent. Download org. In JSON tutorial we coverd all topics from basic to advanced level which will give clear idea to use JSON files in applications with live examples. JSON (JavaScript Object Notation) è un semplice formato per lo scambio di dati. Data in jq is represented as streams of JSON values - every jq expression runs for each value in its input stream, and can produce any number of values to its output stream. This document details the protocol interface between the Alexa service and the web service or Lambda function you create. js to display PDF file all the time or only use pdf. Surprisingly there didn’t seem to be any self-contained example or tutorial (that I could find) that showed how to do this basic operation. Our JSON tutorial will help you to learn JSON fundamentals, example, syntax, array, object, encode, decode, file, date and date format. JSON is short for JavaScript Object Notation. Note that if you are new to Jackson this is probably the best place to begin even if you are looking at a way to parse JSON. 0 of D3; consider reading them alongside the latest release notes, the 4. As an example, we’ll use the example_iauthfunctions extension that’s packaged with CKAN. The responses can be sent as XML or JSON. Now that we have a sentiment analysis module, we can apply it to just about any text, but preferrably short bits of text, like from Twitter! To do this, we're going to combine this tutorial with the Twitter streaming API tutorial. Not exactly by the wayside, but I've been struggling with the new PDF builder for ages. headings An array with one element per table column. JSON String Escape / Unescape. NET Standard 2. Hey, Fellow REST API Designer! Building RESTful web services, like other programming skills is part art, part science. That means it is really very simple and easy to learn without sparing much time. XML Schema Standards. You'll see hands-on examples of working with Python's built-in "json" module all the way up to encoding and decoding custom objects. · This is the one!!! http. jQGrid with JSON Tutorial. The responses can be sent as XML or JSON. We can also convert any JSON received from the server into JavaScript objects. Detailed Images. Download jQuery Tutorial for Beginners PDF. 150 Free Woodworking DIY Plans Get Jquery Build Html Table From Json: Learn techniques & deepen your practice with classes from pros. Jackson JSON Java Parser is very popular and used in Spring framework too. Open source tools like Apache® Spark™ help developers gain quick insights from data in web, mobile and IoT apps, enabling large-scale analysis of JSON without manual data preparation or transformation. net is an online application run your own JSON schemas against example documents. We have trained over 90,000 students from over 16,000 organizations on technologies such as Microsoft ASP. Introduction to JSON Welcome to JavaScript 2! In this course, you'll learn advanced JavaScript, JSON and AJAX and how to use them to suit your professional and creative goals. The Flickr JSON is a little confusing, and it doesn’t provide a direct link to the thumbnail version of our photos, so we’ll have to use some trickery on our end to get to it, which we’ll cover in just a moment. by Ranjith kumar Posted on January 21, 2017 March 20, 2018. •A JSON encoder must only produce well-formed JSON text. You don't need to know how an electric motor fits together if all you want to do is pick up the groceries. A JSON:API document MAY include information about its implementation under a top level jsonapi member. Tom Ross ‘Captain COBOL’ SHARE San Jose. I was used sample rest service to get json data and processed as jQuery datatables needed, also added searching, pagination and sorting on jQuery Datatables listing. Save Your Code. If you want to use the class globally, I suggest to create a proxy class, in your own namespace, with a reduced interface (serialize/deserialize only) and call local copy (local class of it) of /UI2/CL. Course Objectives When you complete this course, you will be able to: use JSON to serialize data for storage in the browser or on the server. For example. 2, which was promulgated with the express purpose of bringing YAML "into compliance with JSON as an official subset". This tutorial focuses on an SQL interface that was introduced in Db2® 11 for z/OS® that enables you to extract and retrieve JSON data from BSON objects and to convert from JSON to BSON. One of the nice features in Google Spreadsheets is the option to publish your data in various formats, including HTML, CSV, PDF, and XML. js/V8 and web browsers. Following is the sample JSON that we are going to parse in this tutorial. No coding necessary. If present, the value of the jsonapi member MUST be an object (a “jsonapi object”). Course Objectives When you complete this course, you will be able to: use JSON to serialize data for storage in the browser or on the server. Preview JSON Tutorial (PDF Version). js Tutorial, we shall learn to convert Buffer data to a JSON object. NET 4 tutorial instead. Save Your Code. js, and connect it to an iOS or Android app! As a mobile app developer, I love to build REST APIs using the Node. A picture is worth a thousand words, let’s compare a simple definition in JSON…. Introducing the ASP. [4] • JSON is built on two structures: Object: A collection of name and value ppairs Array: An ordered list of values Jan. Json example pdf. Ill show you how to create JSON objects and arrays and also how to make an Ajax request to a. Using JSON. You’ll create your own Hello World repository and learn GitHub’s Pull Request workflow, a popular way to create and review code. It will also clean up your JSON and show a data viewer to assist you while you are developing. JSON-LD stands for JavaScript Object Notation for Linked Data, which consists of multi-dimensional arrays (think: list of attribute-value pairs). Typically, in terms of SEO, JSON-LD is implemented leveraging the. js and Express 4 Beginners. js package manager) By installing TypeScript’s Visual Studio plugins. It is an implementation format for structuring data analogous to Microdata and RDFa. For your first steps in understanding how to use Jackson, following tutorials are good places to start: Jackson Tutorial by StudyTrails; Jackson in N minutes (README for jackson-databind project) Older Jackson in 5 minutes version. By the way, we are in the process of going through the major update of our present JSON tutorials, more useful content is going to be added to serve a better and improved learning material to our users. Saving and sending records as a PDF file. In this tutorial, you'll learn how to parse XML and JSON. This multi-part tutorial on PHP-JavaScript interactions describes and demonstrates the old-school approaches as well as JavaScript Object Notation (JSON). js rest api tuts. Although JSON resembles an object or an array, JSON is a string. That is, it's a way to. Go by Example. This JSON Tutorial is special designed for beginners to learn. js in 24 Hours 15 JSON APIs 265. JSON adalah bahasa pemograman independent. It also includes the capability to convert between JSON and XML, HTTP headers, Cookies, and CDL. Or you do window. May 31, 2006. We just saw an example that uses HTTP to get the content of a book. In Python 2. json (not to be confused with Google's org. Spring 4 MVC REST Controller Service Example (JSON CRUD Tutorial) – A step by step tutorial to understand Spring 4 MVC REST API and to create RESTful service using Spring 4. js is a tiny javascript library to help printing from the web. exe is used to generate documentation for programs. This tutorial introduces the reader informally to the basic concepts and features of the Python language and system. how to use newtonsoft JSON to serialize and deserialize in asp. This Library can convert Objects to JSON strings and viceversa with the standard defined on www. JSON is a common format you face every now and then in JavaScript, whether its client side or server side. Code Trench. Self-descriptive messages: Resources are decoupled from their representation so that their content can be accessed in a variety of formats, such as HTML, XML, plain text, PDF, JPEG, JSON, and others. This tutorial introduces the basics of the Document Object Model(DOM) API. We will start this WCF tutorial from beginner level and take to professional level. Summary: in this tutorial, you will learn how to use MySQL JSON data type to store JSON documents in the database. It also includes the capability to convert between JSON and XML, HTTP headers, Cookies, and CDL. Update: For more information, you can download our free ebook, The Ultimate Guide to the WordPress REST API. In Python, we’ll use the requests library to do this. js , 30 days of node, Day 1 of 30 days of node tutorial series we learn how to create a simple http server in node. If you want to learn more about the inner workings of package. In Python, we'll use the requests library to do this. Learn REST: A RESTful Tutorial. JSON Tutorial JSON or JavaScript Object Notation is a lightweight is a text-based open standard designed for humanreadable data interchange. Like this post?. NET type objects into JSON-encoded data and then deserialize data in the JSON. NET object and vice versa. An Angular 5 Tutorial: Step by Step Guide to Your First Angular 5 App Sergey Moiseev Sergey is a full-stack software engineer with experience developing complex web projects. It is simple wrapper of tabula-java and it enables you to extract table into DataFrame or JSON with Python. Or you do window. What is JSON-P?. Regular expressions (regex or regexp) are extremely useful in. JSON is used for exchanging and storing data. mdb Classic. We can also convert any JSON received from the server into JavaScript objects. 4 for all of our examples. XML - the Snake Oil of the Internet age? 2. Whether you have to convert JSON to Java Object or otherwise, you need to write a lot of code that is tightly coupled with the JSON structure. • Colorized values, color depends of the value type. Using Bootstrap 3. I understand the script referenced in in src tag gets executed with Json Array from server on the Victims browser, but can you please exaplain how the Bad guy will get access to this sensitive Json array ?. March 8, 2017. JSON Defined. NET object is using the JsonSerializer. The GSON JsonReader is the GSON streaming JSON parser. pdf - Free download as PDF File (. Mapping a single ecosystem type PDF; 2. Installing plug-ins. JSON (JavaScript Object Notation) is an efficient data encoding format that enables fast exchanges of small amounts of data between client browsers and AJAX-enabled Web services. Introduction to MySQL JSON data type. JavaScript Object Notation (JSON) has replaced XML as the core way of sharing data, especially when it comes to JavaScript, since it's so much faster, sleeker, and easier to parse. When the component is first created, we want to GET some JSON from the server and update the state to reflect the latest data. DMTF welcomes extensions to Redfish and works with its Alliance Partners and OEMs to leverage and expand the standard. • Edit, add, move, remove, and duplicate fields and values. Net in C# Example The following example shows how you can deserialize a JSON string containing into an Object (i. Examples might be simplified to improve reading and basic understanding. parse method instead. Importing json module allows you to encode python objects as JSON strings, and decode JSON strings into python objects. JSON i About the Tutorial JSON or JavaScript Object Notation is a lightweight text-based open standard designed for human-readable data interchange. It’s a strict superset of JSON, with the addition of syntactically significant newlines and indentation, like Python. class json. In this post I am not going to use JADE which is a markup scheme used in most of Express project, instead, I am using basic HTML page as mark up language. A slide presentation detailing the basics of JSON and it's uses. Browse to your JSON file location, select it, and click Open. Made for Beginners. We defined id and name as string and price as number. The generated documentation contains the original schema data, diagrams, detailed properties, type hierarchy, and annotations, hyper-linked to allow simple site navigation. Recently I started learning and working on Node. JSON files are treated as JavaScript. Developer friendly. Since I love boring solutions, for this tutorial I will call the two buckets textract_raw_files and textract_json_files. ये पुस्‍तक PDF EBook के रूप में है, इसलिए आप इस पुस्‍तक को न केवल अपने Computer पर पढ सकते हैं, बल्कि आप इस पुस्‍तक को किसी भी ADOBE Reader Supported Mobile Phone, Tablet PC, Netbook. mdb Payroll. That means it is really very simple and easy to learn without sparing much time. The Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems. • Sort arrays and objects. Make your changes and simply hit refresh!. Unlike pickle, JSON has the benefit of. And the best part: Validation can happen automatically!. You will learn how to set up and use Solr to index and search, how to analyze and solve common problems, and how to use many of Solr’s features such as faceting, spell checking, and highlighting. You also can extract tables from PDF into CSV, TSV or JSON file. We can use JSON. We could also use the same bucket, theoretically, but with two buckets we can have better access control. You can also check Restful interview questions with answers for beginners and experienced. JSON can’t store every kind of Python value. These tutorials will help you learn the essentials of Ext JS using basics to advance level topics. Play Framework makes it easy to build web applications with Java & Scala. Just serialize the Javascript object as JSON using JSON. Recently I started learning and working on Node. Spreadsheet / PDF / PowerPoint. In this video we will talk about JSON, JavaScript object literals and AJAX. You don’t need to know how an electric motor fits together if all you want to do is pick up the groceries. In JSON tutorial we coverd all topics from basic to advanced level which will give clear idea to use JSON files in applications with live examples. Data in jq is represented as streams of JSON values - every jq expression runs for each value in its input stream, and can produce any number of values to its output stream. json extension when it stands. Visual Studio Code is a lightweight but powerful source code editor which runs on your desktop and is available for Windows, macOS and Linux. JSON Utils is a site for generating C#, VB. The JSON filename extension is. Python simplejson tutorial shows how to read and write JSON data with Python simplejson module. Format your SQL to clean it up, Enter dirty, minified SQL code to beautify, format, prettify, Make your sql easier to read. ©2009-2010 - Cesare Pautasso, Erik Wilde 6 Design Methodology 1. There is a lot of variety in the syntax of the JSON functionality, which for simplicity is avoided here. JSON objects are used for transferring data between server and client, XML serves the same purpose. The following characters are reserved in JSON and must be properly escaped to be used in strings:. js Tutorial, we shall learn to convert Buffer data to a JSON object. js – To convert JSON to Buffer, first convert JSON object to string , then use method to read the JSON string to a buffer. •A JSON encoder must only produce well-formed JSON text. Thismember is omitted if the table has no caption. Fork me on github. XML to JSON and JSON to XML converter online. JSON with Perl in JSON (JavaScript Object Notation) - JSON with Perl in JSON (JavaScript Object Notation) courses with reference manuals and examples pdf. It can contain values of only the following data types: strings, integers, floats, Booleans, lists, dictionaries, and NoneType. XML is a “heavier” protocol that is also hierarchical in nature, but with a great deal more. In small projects (like the one in this tutorial), that should be enough. An Angular 5 Tutorial: Step by Step Guide to Your First Angular 5 App Sergey Moiseev Sergey is a full-stack software engineer with experience developing complex web projects. Today you woke up with an alarm bell ringing in the back of your mind that said WHAT THE BLOODY HELL IS THIS JSON THING AND WHY IS IT EVERYWHERE ALL OF A BLOODY SUDDEN! Well I had a slow bus ride home tonight (friday is always slow) and i took a pile of "JSON" tutorials with me. dojo/request is a new API (introduced in Dojo 1. JSON (or JavaScript Object Notation) is a lightweight, easy and popular way to exchange data. The Little JavaScripter. It also supports compressing data to minimize size. This tutorial would help you learn Java like a pro. The tutorial assumes no prior knowledge of JSON. js Tutorial, we shall learn to convert Buffer data to a JSON object. Kindly note that the normative copy is the HTML version; the PDF version has been produced to generate a printable document. Make your changes and simply hit refresh!. This course is available as a printed book , video or PDF e-book. Create an PDF, HTML or ASP. JavaScript and PHP Tutorials JavaScript with PHP JSON, PHP, and JavaScript Information on passing data from PHP to JSON and JavaScript. JAX-RS: Java API for RESTful Web Services (JAX-RS) is a Java programming language API spec that provides support in creating web services according to the Representational State Transfer (REST) architectural pattern. simple and then we will read JSON file back. “ new function parse-json() is provided to convert from lexical JSON to the corresponding structure of maps and arrays. The JSON format was originally specified by Douglas Crockford, and is described in RFC 4627. Didn't seem to be much point in working on anything else until the compilation process and builder were fixed (and both are almost finished). Decode a JSON document from s (a str beginning with a JSON document) and return a 2-tuple of the Python representation and the index in s where the document ended. Most web applications are designed to exchange data in the JSON format. •A JSON encoder must only produce well-formed JSON text. Terrain tutorial - getting more out of the built in terrain engine TreeCreator Tutorial Working with the built in tree creator. 150 Free Woodworking DIY Plans Get Jquery Build Html Table From Json: Learn techniques & deepen your practice with classes from pros. WCF Data Services Tutorial – A Step by Step Approach Create a WCF Data Service. json to prevent accidental publication of private repositories as well as suppressing any warnings generated when running. In our next tutorials we will explore deeper into the details of implementing the remote backend API using Loopback and how to deploy it in a remote server. Learn Free JSON Tutorial, PDF JSON Tutorial, JSON Tutorial for Beginners, JSON Tutorial for Python, JSON Formatter, See all the tutorials and examples related to json as basic, advance and professional. Using JSON. JSONObject and org. JSON files are lightweight, text-based, human-readable, and can be edited using a text editor. A serialized string, which means it can later be parsed and decoded into data types. Examples might be simplified to improve reading and basic understanding. You'll see hands-on examples of working with Python's built-in "json" module all the way up to encoding and decoding custom objects. It will also clean up your JSON and show a data viewer to assist you while you are developing. Surprisingly there didn’t seem to be any self-contained example or tutorial (that I could find) that showed how to do this basic operation. The JSON filename extension is. When the component is first created, we want to GET some JSON from the server and update the state to reflect the latest data. js Tutorial, we shall learn to convert Buffer data to a JSON object. Spring Mvc Multipart Request With Json. If you click the save button, your code will be saved, and you get an URL you can share with others. The Python interpreter is easily extended with new functions and data types implemented in C or C++ (or other languages callable from C). Online JSON Formatter and Online JSON Validator also provides tools to convert JSON to XML, JSON to CSV, JSON Editor , JSONLint and JSON Checker. js Tutorial, Part I. Go by Example. From the parameters, you can easily guess the service method url, request type (POST) and data type (JSON). That means you can convert from Python objects to JSON objects and vice-versa. Save Your Code. This slide show is from my presentation on what JSON and REST are. Skip to content. PHP, JavaScript, and JSON. Click the Data tab, then Get Data > From File > From JSON. While many people brush the language off as nothing more than a browser scripting language, it actually supports many advanced concepts such as object-oriented-programing, recursion, lambda, and closures. The official Internet media type for JSON is application/json. Parasoft SOAtest helps users test applications with multiple interfaces (i. pdf If you do not have copies of these files, you can download them from here. By the way, we are in the process of going through the major update of our present JSON tutorials, more useful content is going to be added to serve a better and improved learning material to our users. In our case id, name, price will be members (or properties) of the JSON Object. Rest-Assured is a Java-based library that is used to test RESTful Web Services. Simple and easy to follow free Java tutorials on spring framework, spring boot, angular, maven, hibernate, jpa, concurrency, collections and much more. Here is an example of JSON data:. json file CODE: Code for. ElementTree tutorial: http://effbot. Also, as each record is a separate line, you can process big files without having to fit everything in memory, there are tools like JQ to help doing that at the command-line. …These lists start with an open curly bracket,…have a list of key-value pairs,…and then end with a closing curly bracket. Automatically Generating JSON from Java ObjectsJava Objects More Servlets and JSP, and this tutorial Available at and this tutorial. Webucator provides instructor-led training to students throughout the US and Canada. Made for Beginners. JSON is designed to store and organize data similar to XML, but JSON is smaller, faster, and easier to parse than XML. Explore JSON and connecting to APIs using javascript by setting up your own JSON server practice AJAX and JSON locally Step by step learning of how to use JSON data within your javascript code. by Ranjith kumar Posted on January 21, 2017 March 20, 2018. The JSON-Java library is also known as org. • Now I much prefer JSON over XML. We want to demonstrate how PHP as a server side language, communicates with backend MySQL, and meanwhile renders front-end HTML. Purpose: Encode Python objects as JSON strings, and decode JSON strings into Python objects. Use HTML5 to display PDF files if users don't have pdf plugin for their browsers. Hacking without Proxies. In this tutorial, you are going to learn. JSON tutorial is targeted for beginners as well as experienced people who is having basic knowledge to implement applications using JavaScript and jQuery. The method JSON. The Python interpreter is easily extended with new functions and data types implemented in C or C++ (or other languages callable from C). The Jackson JSON toolkit contains a set of Java annotations which you can use to influence how JSON is read into objects, or what JSON is generated from the objects. It also supports compressing data to minimize size. Learn how text, data and iexisitng PDF's can be easily included and the powerful layout options ReportLab gives. Monarch Studio Tutorial 7 [4] Assumptions This tutorial assumes that you have copies of the following files stored in your computer: Beantown. JSON-LD stands for JavaScript Object Notation for Linked Data, which consists of multi-dimensional arrays (think: list of attribute-value pairs). W3Schools is optimized for learning, testing, and training. Any information that can be named can be a resource: a document or image, a temporal service, a collection of other resources, a non-virtual object (e. The Barracuda JSON parser parses JSON and feeds the parsed JSON to an JParserIntf instance. Also, a JSON Schema MAY contain properties which are not schema keywords. JSON stands for JavaScript Object Notation is known as a lightweight text-based open standard designed for human-readable data interchange. JSON is a popular data exchange format between browsers and web servers because the browsers can parse JSON into JavaScript objects natively. This time we will learn together about jqGrid. IETF has taken care of that, and OpenID connect mandates the use of JSON Web token for all of the tokens that are exchanged in that protocol. Django Tutorials General Tutorials Django Girls tutorial - the course material used for the DjangoGirls workshops Learn Django - An entry level and project-based course to learn Django Intuitive 20 video tutorial series for Django beginners Short beginner tutorial on building a basic blog site Full Web Framework Python Django Tutorial. If you are unfamiliar with Java annotations, read my Java. NET Web API. json elasticbeanstalk. You will build an Apache Cordova (aka PhoneGap) Employee Directory application from scratch using the Single Page Architecture, HTML templates, touch events, and performance optimization techniques. Includes introduction, JUnit testing, XML handling, the Java Persistence API (JPA), the Spring framework and more. It produces and consumes JSON text in a streaming fashion (similar to StAX API for XML) and allows to build a Java object model for JSON text using API classes (similar to DOM API for XML). How to work with JSON fields using the Eloquent ORM in Laravel. js server , hello world example in node. Json complete Tutorials, Learn Json with Java/jsp, using Json in java/jsp, examples of Json with java servlets, Json complete tutorials with examples Please consider disabling your ad blocker for Java4s. That's why its. As we mentioned above, using an external module would be the key. Mangroves of the Gulf of Carpentaria YouTube; 2. At the risk of being Captain Obvious, you’re going to need a spreadsheet if you want to follow along with this post. This is a reference implementation. JSON Processing (JSON-P) is a Java API to process (for e. The native JSON data type allows you to store JSON documents more efficiently than the JSON text format in the previous versions. JSON is text, and we can convert any JavaScript object into JSON, and send JSON to the server. Use the remap user guide and tutorials to quickly get started with making maps with Remap. mobile, web, API, database). JSON i About the Tutorial JSON or JavaScript Object Notation is a lightweight text-based open standard designed for human-readable data interchange. Here is an example of a program that will process “projects. Data in jq is represented as streams of JSON values - every jq expression runs for each value in its input stream, and can produce any number of values to its output stream. Does your company write an API for its software? If the answer is yes, then you absolutely need to test it — and fortunately for you, this tutorial explains step-by-step how to conduct automated API testing using tools like Postman, Newman, Jenkins and qTest Manager. 1) for JSON Developer's Guide xxi Part I Introduction to JSON Data and Oracle Database 1 JSON in Oracle Database 1. The module we will be using in this tutorial is PyPDF2. to_json() to denote a missing Index name, and the subsequent read_json() operation. One of the nice features in Google Spreadsheets is the option to publish your data in various formats, including HTML, CSV, PDF, and XML. Retrofit Android Tutorial : Example of Retrofit 2. io solves this with ease. mdb Payroll. Co DOC to PDF API converts DOC files to PDF from an URL. In our next tutorials we will explore deeper into the details of implementing the remote backend API using Loopback and how to deploy it in a remote server. open('you_pdf_url. Hello friends, we meet again. JavaScript is a prototype-based language that contains no class statement, as you'd find in C++ or Java (this is sometimes confusing for programmers accustomed to languages with a class statement). JSON is self-describing & platform independent technology. As400 Cobol Tutorial Pdf COBOL stands for Common Business-Oriented Language. So far in this guide, we talked a lot about REST and related concepts. You can import the usual json functions dump(s) and load(s), as well as a separate comment removal function, as follows:. In this tutorial you'll learn how to read and write JSON-encoded data using Python. Spring 4 MVC REST Controller Service Example (JSON CRUD Tutorial) – A step by step tutorial to understand Spring 4 MVC REST API and to create RESTful service using Spring 4. Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more. Please suggest some tutorials or links to understand it.

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