John David

John David

1559527629

The complete beginner’s guide to JSON

In this post, you’ll see a complete beginner’s guide to JSON without assuming any prior knowledge and explain the concept of JSON with simple examples.

If you are into Data Science or Software Engineering or any related field, you may have come across the term “JSON”, and if you’re a newbie, you might be confused.

Let’s get started.

What is JSON?

Created by Katerina Limpitsouni

JSON stands for *JavaScript Object Notation. *Don’t get carried away by the jargon, it’s actually straightforward to understand and use. As the word “notation” might hint, JSON is simply a way of representing data independent of a platform — this just means that it is something like a PDF (which is the same across different platforms like mobile, desktop and web) for data. The JSON format was specified by Douglas Crockford, and the filename extension is, as you can guess, .json.

Thus, the PDF for data travels across platforms and maintains consistency in representation and storage. It is widely used today and therefore, crucial in the fields of Data Science and Software Engineering.

Why JSON?

Created by Katerina Limpitsouni

JSON sounds cool, but what is the motivation or purpose behind it?

As highlighted above, JSON being independent of a platform is one of the major choices of format for transfer of data between computers that exchange tons of data each day.

An alternative to JSON is XML (extensible markup language), but JSON is better in many ways. While both are human-readable and machine-readable, JSON is much easier to read and is also faster for computers to process. Furthermore, JSON is processed (or parsed) with a JavaScript parser (which is built-into most web-browsers) while XML requires a separate XML parser. This is where the “JavaScirpt” comes into play in “JSON.” The practical implication of this is that

You can read more about the differences here and here.

How to JSON?

Created by Katerina Limpitsouni

After you’ve understood what JSON is and the rationale behind it, you can now jump into writing some JSON code. JSON syntax is very similar to JavaScript so it would be familiar if you have prior experience with JavaScript.

Let us work through an example to understand writing JSON. Let’s say that you are the leader of your neighbourhood and maintain a database for all the people in it. Consider a scenario when Mr Jodhn Appleseed moves into your neighbourhood. You may want to store information like his first name, last name, date of birth, marital status, etc. Let’s use JSON for this!

When you’re writing JSON, you’re essentially a match-maker! Yes, really! But instead of people, you match data. In JSON, data is stored as key-value pairs — every data item has a key through which you can modify, add or delete the data item. JSON files are enclosed by {} curly braces which contain these key-value pairs.

Let’s start by adding the first name and last names:

{
    "first name":"John",
    "last name":"Appleseed"
}

As you can notice, the values in the left column are the keys (“first name”, “last name”) and the values in the right column are the respective values (“John”, “Appleseed”). A colon separates them. The values encompassed with double quotes are of type String — which essentially means that they are meant to be text and not refer to something else (e.g. a number, variable in another part of the file, etc.).

Note that in JSON, all keys must be strings —so must be enclosed with the double quotes. Also, there’s a comma after each key-value pair except for the last one, indicating that a new item is being recorded.

Now, let’s add his age:

{
    "first name":"John",
    "last name":"Appleseed",
    "age":30
}

Note that there are no double quotes around the number 30. Intuitively, the data type of such data is number, and hence you can perform mathematical operations on them (when you retrieve the information). In JSON, this data type (number) can take on any numerical value — decimal or integer or any other type. Notice also how I added a comma after “Appleseed” as I added another item below it.

Let’s do something fun now. Let’s try to add his house, which would have its address, owner information, and city. But how do we add these things into the JSON file for John? Things like owner info are attributes of the house and not John, so it doesn’t make sense to add this info directly into the JSON file for John. Worry not, JSON has an interesting data-type to handle this!

In JSON, a value can also be an Object (something that is a key-value pair too). This object is just like another JSON file — enclosed with curly braces and containing key-value pairs, except that it is within our original JSON file instead of having a file of its own.

{
    "first name" : "John",
    "last name" : "Appleseed",
    "age" : 30, 
    "house" : { 
            "address":{
                "house no":22,
                "street":"College Ave East",
                "city":"Singapore",
            },
            "owner":"John Appleseed"
            "market price($)":5000.00
    }
}

As you may notice, the house is an Object, which contains the keys address, owner and market price. The data in address is also an Object, containing the keys house no, street and city. Thus, it is possible to nest objects within objects, and this allows for a more clear representation of data, as shown above.

Now, let’s add info about his friends. We might do this by adding “friend1” and name, “friend2” and name, and so on but this would quickly become boring. JSON provides a data type for storing such info effectively, and it is called an array. It is an ordered collection of items — which can be of any data type.

Let’s say he has three friends: Charles, Mark and Darren. Our JSON file would now look something like this:

{
    "first name":"John",
    "last name":"Appleseed",
    "age":30, 
    "house" : { 
            "address":{
                "house no":22,
                "street":"College Ave East",
                "city":"Singapore",
            },
            "owner":"John Appleseed"
            "market price($)":5000.00
    },
    "friends":[
        "Charles",
        "Mark",
        "Darren"
     ]
}

Notice that the array is enclosed with square braces and we wrote each item in a newline followed by a comma except for the last one. The new line is not necessary, but it helps the readability of the code for humans.

Lastly, let’s add his marital status. We could do something like "married":"yes" but JSON provides a special data type for all dichotomous choices: a boolean. It can only take on two values: true or false. Intuitively, it can’t be both at the same time. Assume that John is a bachelor. Let’s add this final piece of information to our file! Our file now looks like this:

{  
   "first name":"John",
   "last name":"Appleseed",
   "age":30,
   "house":{  
      "address":{  
         "house no":"D12",
         "street":"College Ave East",
         "city":"Singapore"
      },
      "owner":"John Appleseed",
      "market price ($)":50000.00
   },
   "friends":[  
      "Charles",
      "Mark",
      "Darren"
   ],
   "married":false
}

And, you’ve familiarised yourself with JSON. In this article, we understood what JSON is, why it is useful and finally, how to do (some) JSON. In doing so, we learnt about the JSON data types (String, Number, Array, Object and Boolean).

The file above is a GitHub gist, and you can follow this link to download the file and play around with it, add some more info or make JSON files for new people. I hope this article helped you get introduced to JSON. Let me know how your journey is by responding to this story.

#data-science #javascript

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The complete beginner’s guide to JSON
Mike  Kozey

Mike Kozey

1656151740

Test_cov_console: Flutter Console Coverage Test

Flutter Console Coverage Test

This small dart tools is used to generate Flutter Coverage Test report to console

How to install

Add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):

dev_dependencies:
  test_cov_console: ^0.2.2

How to run

run the following command to make sure all flutter library is up-to-date

flutter pub get
Running "flutter pub get" in coverage...                            0.5s

run the following command to generate lcov.info on coverage directory

flutter test --coverage
00:02 +1: All tests passed!

run the tool to generate report from lcov.info

flutter pub run test_cov_console
---------------------------------------------|---------|---------|---------|-------------------|
File                                         |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/                                     |         |         |         |                   |
 print_cov.dart                              |  100.00 |  100.00 |   88.37 |...,149,205,206,207|
 print_cov_constants.dart                    |    0.00 |    0.00 |    0.00 |    no unit testing|
lib/                                         |         |         |         |                   |
 test_cov_console.dart                       |    0.00 |    0.00 |    0.00 |    no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
 All files with unit testing                 |  100.00 |  100.00 |   88.37 |                   |
---------------------------------------------|---------|---------|---------|-------------------|

Optional parameter

If not given a FILE, "coverage/lcov.info" will be used.
-f, --file=<FILE>                      The target lcov.info file to be reported
-e, --exclude=<STRING1,STRING2,...>    A list of contains string for files without unit testing
                                       to be excluded from report
-l, --line                             It will print Lines & Uncovered Lines only
                                       Branch & Functions coverage percentage will not be printed
-i, --ignore                           It will not print any file without unit testing
-m, --multi                            Report from multiple lcov.info files
-c, --csv                              Output to CSV file
-o, --output=<CSV-FILE>                Full path of output CSV file
                                       If not given, "coverage/test_cov_console.csv" will be used
-t, --total                            Print only the total coverage
                                       Note: it will ignore all other option (if any), except -m
-p, --pass=<MINIMUM>                   Print only the whether total coverage is passed MINIMUM value or not
                                       If the value >= MINIMUM, it will print PASSED, otherwise FAILED
                                       Note: it will ignore all other option (if any), except -m
-h, --help                             Show this help

example run the tool with parameters

flutter pub run test_cov_console --file=coverage/lcov.info --exclude=_constants,_mock
---------------------------------------------|---------|---------|---------|-------------------|
File                                         |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/                                     |         |         |         |                   |
 print_cov.dart                              |  100.00 |  100.00 |   88.37 |...,149,205,206,207|
lib/                                         |         |         |         |                   |
 test_cov_console.dart                       |    0.00 |    0.00 |    0.00 |    no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
 All files with unit testing                 |  100.00 |  100.00 |   88.37 |                   |
---------------------------------------------|---------|---------|---------|-------------------|

report for multiple lcov.info files (-m, --multi)

It support to run for multiple lcov.info files with the followings directory structures:
1. No root module
<root>/<module_a>
<root>/<module_a>/coverage/lcov.info
<root>/<module_a>/lib/src
<root>/<module_b>
<root>/<module_b>/coverage/lcov.info
<root>/<module_b>/lib/src
...
2. With root module
<root>/coverage/lcov.info
<root>/lib/src
<root>/<module_a>
<root>/<module_a>/coverage/lcov.info
<root>/<module_a>/lib/src
<root>/<module_b>
<root>/<module_b>/coverage/lcov.info
<root>/<module_b>/lib/src
...
You must run test_cov_console on <root> dir, and the report would be grouped by module, here is
the sample output for directory structure 'with root module':
flutter pub run test_cov_console --file=coverage/lcov.info --exclude=_constants,_mock --multi
---------------------------------------------|---------|---------|---------|-------------------|
File                                         |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/                                     |         |         |         |                   |
 print_cov.dart                              |  100.00 |  100.00 |   88.37 |...,149,205,206,207|
lib/                                         |         |         |         |                   |
 test_cov_console.dart                       |    0.00 |    0.00 |    0.00 |    no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
 All files with unit testing                 |  100.00 |  100.00 |   88.37 |                   |
---------------------------------------------|---------|---------|---------|-------------------|
---------------------------------------------|---------|---------|---------|-------------------|
File - module_a -                            |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/                                     |         |         |         |                   |
 print_cov.dart                              |  100.00 |  100.00 |   88.37 |...,149,205,206,207|
lib/                                         |         |         |         |                   |
 test_cov_console.dart                       |    0.00 |    0.00 |    0.00 |    no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
 All files with unit testing                 |  100.00 |  100.00 |   88.37 |                   |
---------------------------------------------|---------|---------|---------|-------------------|
---------------------------------------------|---------|---------|---------|-------------------|
File - module_b -                            |% Branch | % Funcs | % Lines | Uncovered Line #s |
---------------------------------------------|---------|---------|---------|-------------------|
lib/src/                                     |         |         |         |                   |
 print_cov.dart                              |  100.00 |  100.00 |   88.37 |...,149,205,206,207|
lib/                                         |         |         |         |                   |
 test_cov_console.dart                       |    0.00 |    0.00 |    0.00 |    no unit testing|
---------------------------------------------|---------|---------|---------|-------------------|
 All files with unit testing                 |  100.00 |  100.00 |   88.37 |                   |
---------------------------------------------|---------|---------|---------|-------------------|

Output to CSV file (-c, --csv, -o, --output)

flutter pub run test_cov_console -c --output=coverage/test_coverage.csv

#### sample CSV output file:
File,% Branch,% Funcs,% Lines,Uncovered Line #s
lib/,,,,
test_cov_console.dart,0.00,0.00,0.00,no unit testing
lib/src/,,,,
parser.dart,100.00,100.00,97.22,"97"
parser_constants.dart,100.00,100.00,100.00,""
print_cov.dart,100.00,100.00,82.91,"29,49,51,52,171,174,177,180,183,184,185,186,187,188,279,324,325,387,388,389,390,391,392,393,394,395,398"
print_cov_constants.dart,0.00,0.00,0.00,no unit testing
All files with unit testing,100.00,100.00,86.07,""

Installing

Use this package as an executable

Install it

You can install the package from the command line:

dart pub global activate test_cov_console

Use it

The package has the following executables:

$ test_cov_console

Use this package as a library

Depend on it

Run this command:

With Dart:

 $ dart pub add test_cov_console

With Flutter:

 $ flutter pub add test_cov_console

This will add a line like this to your package's pubspec.yaml (and run an implicit dart pub get):

dependencies:
  test_cov_console: ^0.2.2

Alternatively, your editor might support dart pub get or flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:test_cov_console/test_cov_console.dart';

example/lib/main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Author: DigitalKatalis
Source Code: https://github.com/DigitalKatalis/test_cov_console 
License: BSD-3-Clause license

#flutter #dart #test 

Brandon  Adams

Brandon Adams

1625637060

What is JSON? | JSON Objects and JSON Arrays | Working with JSONs Tutorial

In this video, we work with JSONs, which are a common data format for most web services (i.e. APIs). Thank you for watching and happy coding!

Need some new tech gadgets or a new charger? Buy from my Amazon Storefront https://www.amazon.com/shop/blondiebytes

What is an API?
https://youtu.be/T74OdSCBJfw

JSON Google Extension
https://chrome.google.com/webstore/detail/json-formatter/bcjindcccaagfpapjjmafapmmgkkhgoa?hl=en

Endpoint Example
http://maps.googleapis.com/maps/api/geocode/json?address=13+East+60th+Street+New+York,+NY

Check out my courses on LinkedIn Learning!
REFERRAL CODE: https://linkedin-learning.pxf.io/blondiebytes
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Check out my Python Basics course on Highbrow!
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Quick Code Tutorials: https://www.youtube.com/watch?v=4K4QhIAfGKY&index=1&list=PLcLMSci1ZoPu9ryGJvDDuunVMjwKhDpkB

Command Line: https://www.youtube.com/watch?v=Jm8-UFf8IMg&index=1&list=PLcLMSci1ZoPvbvAIn_tuSzMgF1c7VVJ6e

30 Days of Code: https://www.youtube.com/watch?v=K5WxmFfIWbo&index=2&list=PLcLMSci1ZoPs6jV0O3LBJwChjRon3lE1F

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#jsons #json arrays #json objects #what is json #jsons tutorial #blondiebytes

Abigail betty

Abigail betty

1624226400

What is Bitcoin Cash? - A Beginner’s Guide

Bitcoin Cash was created as a result of a hard fork in the Bitcoin network. The Bitcoin Cash network supports a larger block size than Bitcoin (currently 32mb as opposed to Bitcoin’s 1mb).

Later on, Bitcoin Cash forked into Bitcoin SV due to differences in how to carry on its developments.

That’s Bitcoin Cash in a nutshell. If you want a more detailed review watch the complete video. Here’s what I’ll cover:

0:50 - Bitcoin forks
2:06 - Bitcoin’s block size debate
3:35 - Big blocks camp
4:26 - Small blocks camp
5:16 - Small blocks vs. big blocks arguments
7:05 - How decisions are made in the Bitcoin network
10:14 - Block size debate resolution
11:06 - Bitcoin cash intro
11:28 - BTC vs. BCH
12:13 - Bitcoin Cash (ABC) vs. Bitcoin SV
13:09 - Conclusion
📺 The video in this post was made by 99Bitcoins
The origin of the article: https://www.youtube.com/watch?v=ONhbb4YVRLM
🔺 DISCLAIMER: The article is for information sharing. The content of this video is solely the opinions of the speaker who is not a licensed financial advisor or registered investment advisor. Not investment advice or legal advice.
Cryptocurrency trading is VERY risky. Make sure you understand these risks and that you are responsible for what you do with your money
🔥 If you’re a beginner. I believe the article below will be useful to you ☞ What You Should Know Before Investing in Cryptocurrency - For Beginner
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#bitcoin #blockchain #bitcoin cash #what is bitcoin cash? - a beginner’s guide #what is bitcoin cash #a beginner’s guide

A Beginner’s Guide to Setting Up a Web Application with Typescript and Express

Web applications are types of software applications that run on remote servers (source). Examples of web applications can range from word processors, to file scanners, video editing tools, shopping carts, and more. Web applications can be great additions to any website; they can even function as websites themselves (Facebook, Gmail, and Udacity’s classroom are all examples of popular web applications), so understanding how to set up and implement a web application is a fantastic skill to have.

For this guide, I am assuming that you already have a basic knowledge of npmnode and whatExpress Requests and Responses are (or that you at least know what they are used for in their basic sense). Also, I assume that you know what the npm install and mkdir commands do. You have to know basic Typescript to implement — or at least know basic JavaScript to read and understand — the code below. Finally, this is the base for the backend of a web application. You still need to create a frontend application using a framework like Angular or an HTML/CSS file to make requests and display responses.

Before you start, it’s important that you create a folder in your favorite place on your computer. This can be anywhere as long as you have a sense of how you are going to find it later when you come up with an awesome project to start developing.

The Process:

Image for post

#web-development #backend #software-development #beginners-guide #beginner

Tia  Gottlieb

Tia Gottlieb

1596336480

Beginners Guide to Machine Learning on GCP

Introduction to Machine Learning

  • Machine Learning is a way to use some set of algorithms to derive predictive analytics from data. It is different than Business Intelligence and Data Analytics in a sense that In BI and Data analytics Businesses make decision based on historical data, but In case of Machine Learning , Businesses predict the future based on the historical data. Example, It’s a difference between what happened to the business vs what will happen to the business.Its like making BI much smarter and scalable so that it can predict future rather than just showing the state of the business.
  • **ML is based on Standard algorithms which are used to create use case specific model based on the data **. For example we can build the model to predict delivery time of the food, or we can build the model to predict the Delinquency rate in Finance business , but to build these model algorithm might be similar but the training would be different.Model training requires tones of examples (data).
  • Basically you train your standard algorithm with your Input data. So algorithms are always same but trained models are different based on use cases. Your trained model will be as good as your data.

ML, AI , Deep learning ? What is the difference?

Image for post

ML is type of AI

AI is a discipline , Machine Learning is tool set to achieve AI. DL is type of ML when data is unstructured like image, speech , video etc.

Barrier to Entry Has Fallen

AI & ML was daunting and with high barrier to entry until cloud become more robust and natural AI platform. Entry barrier to AI & ML has fallen significantly due to

  • Increasing availability in data (big data).
  • Increase in sophistication in algorithm.
  • And availability of hardware and software due to cloud computing.

GCP Machine Learning Spectrum

Image for post

  • For Data scientist and ML experts , TensorFlow on AI platform is more natural choice since they will build their own custom ML models.
  • But for the users who are not experts will potentially use Cloud AutoML or Pre-trained ready to go model.
  • In case of AutoML we can trained our custom model with Google taking care of much of the operational tasks.
  • Pre-trained models are the one which are already trained with tones of data and ready to be used by users to predict on their test data.

Prebuilt ML Models (No ML Expertise Needed)

  • As discuss earlier , GCP has lot of Prebuilt models that are ready to use to solve common ML task . Such as image classification, Sentiment analysis.
  • Most of the businesses are having many unstructured data sources such as e-mail, logs, web pages, ppt, documents, chat, comments etc.( 90% or more as per various studies)
  • Now to process these unstructured data in the form of text, we should use Cloud Natural Language API.
  • Similarly For common ML problems in the form of speech, video, vision we should use respective Prebuilt models.

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