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28 - Use a Pre-Defined Scale to Place Elements - Data Visualization with D3 - freeCodeCamp Tutorial
We're gonna use the scales we created in the previous challenge to place our SVG circle elements.
Link to challenge : https://www.freecodecamp.org/learn/data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements
Concepts:
selection.attr(name[, value])
If a value is specified, sets the attribute with the specified name to the specified value on the selected elements and returns this selection. If the value is a constant, all elements are given the same attribute value; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s attribute. A null value will remove the specified attribute.
If a value is not specified, returns the current value of the specified attribute for the first (non-null) element in the selection. This is generally useful only if you know that the selection contains exactly one element.
https://github.com/d3/d3-selection/blob/v1.4.1/README.md#selection_attr
circle
circle element is used to draw circle with a center point and given radius. cx − x-axis co-ordinate of the center of the circle. Default is 0. cy − y-axis co-ordinate of the center of the circle. Default is 0. r − radius of the circle.
https://developer.mozilla.org/en-US/docs/Web/SVG/Element/circle
selection.text([value])
If a value is specified, sets the text content to the specified value on all selected elements, replacing any existing child elements. If the value is a constant, then all elements are given the same text content; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s text content. A null value will clear the content.
If a value is not specified, returns the text content for the first (non-null) element in the selection. This is generally useful only if you know the selection contains exactly one element.
https://github.com/d3/d3-selection/blob/v1.4.1/README.md#selection_text
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D3.js (also known as D3, short for Data-Driven Documents) is a JavaScript library for producing dynamic, interactive data visualizations in web browsers. It makes use of Scalable Vector Graphics (SVG), HTML5, and Cascading Style Sheets (CSS) standards.
freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an inter
...
https://www.youtube.com/watch?v=Mgou4HdrW8E
Link to challenge : https://www.freecodecamp.org/learn/data-visualization/data-visualization-with-d3/use-a-pre-defined-scale-to-place-elements
Concepts:
selection.attr(name[, value])
If a value is specified, sets the attribute with the specified name to the specified value on the selected elements and returns this selection. If the value is a constant, all elements are given the same attribute value; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s attribute. A null value will remove the specified attribute.
If a value is not specified, returns the current value of the specified attribute for the first (non-null) element in the selection. This is generally useful only if you know that the selection contains exactly one element.
https://github.com/d3/d3-selection/blob/v1.4.1/README.md#selection_attr
circle
circle element is used to draw circle with a center point and given radius. cx − x-axis co-ordinate of the center of the circle. Default is 0. cy − y-axis co-ordinate of the center of the circle. Default is 0. r − radius of the circle.
https://developer.mozilla.org/en-US/docs/Web/SVG/Element/circle
selection.text([value])
If a value is specified, sets the text content to the specified value on all selected elements, replacing any existing child elements. If the value is a constant, then all elements are given the same text content; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s text content. A null value will clear the content.
If a value is not specified, returns the text content for the first (non-null) element in the selection. This is generally useful only if you know the selection contains exactly one element.
https://github.com/d3/d3-selection/blob/v1.4.1/README.md#selection_text
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D3.js (also known as D3, short for Data-Driven Documents) is a JavaScript library for producing dynamic, interactive data visualizations in web browsers. It makes use of Scalable Vector Graphics (SVG), HTML5, and Cascading Style Sheets (CSS) standards.
freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an inter
...
https://www.youtube.com/watch?v=Mgou4HdrW8E
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3 - G
3-get-json-with-the-javascript
TimeStamps:
00:00 - Challenge
00:34 - Introduction to JSON
01:33 - Processing JSON with Parse and Stringify
03:12 - XMLHTTPRequest
10:38 - Challenge Solution
We look into JSON notation and how to process this. Then we look at XMLHttpRequests and how they can be used to obtain JSON data. We open the request and give it properties, call the send method to send it of, and register a function to the onload property to run, once we have a response.
Link to Challenge : https://www.freecodecamp.org/learn/data-visualization/json-apis-and-ajax/get-json-with-the-javascript-xmlhttprequest-method
Concepts:
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate.
https://www.json.org/json-en.html
parse()
The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
stringify()
The JSON.stringify() method converts a JavaScript object or value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
XMLHttpRequest
XMLHttpRequest (XHR) objects are used to interact with servers. You can retrieve data from a URL without having to do a full page refresh. This enables a Web page to update just part of a page without disrupting what the user is doing. XMLHttpRequest is used heavily in AJAX programming.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest
XMLHttpRequest.open()
The XMLHttpRequest method open() initializes a newly-created request, or re-initializes an existing one.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/open
XMLHttpRequest.send()
The XMLHttpRequest method send() sends the request to the server. If the request is asynchronous (which is the default), this method returns as soon as the request is sent and the result is delivered using events. If the request is synchronous, this method doesn't return until the response has arrived.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/send
XMLHttpRequest.onload
The XMLHttpRequestEventTarget.onload is the function called when an XMLHttpRequest transaction completes successfully.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequestEventTarget/onload
XMLHttpRequest.responseText
The read-only XMLHttpRequest property responseText returns the text received from a server following a request being sent.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/responseText
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...
https://www.youtube.com/watch?v=UtPS0WjEnC8
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18 -
18-test-if-object-is-instance-of
The final object methods we look at are instanceOf() and notInstanceOf(). These can be used to determine if an object is an instance of a particular class or constructor.
Link to Challenge : https://www.freecodecamp.org/learn/quality-assurance/quality-assurance-and-testing-with-chai/test-if-an-object-is-an-instance-of-a-constructor
Written Guide: https://www.notion.so/ganeshh123/Test-if-an-Object-is-an-Instance-of-a-Constructor-efa674f7e6ae4ec8bdbe217a4cd0cc74
Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1SVteCORbgwlxJkAbcTiZyj
All Writen Guides for this course : https://www.notion.so/ganeshh123/54ecbf7833414db885eec37f580599b4
All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26
0:00 - Concepts:
0:03 - assert.instanceOf()
Asserts that value is an instance of constructor.
https://www.chaijs.com/api/assert/#method_instanceof
01:50 - assert.notInstanceOf()
Asserts value is not an instance of constructor.
https://www.chaijs.com/api/assert/#method_notinstanceof
02:48 - Challenge Solution
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Chai is an assertion library, similar to Node's built-in assert. It makes testing much easier by giving you lots of assertions you can run against your code.
freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS and JavaScript, students progress to project assignments that they complete either alone or in pairs. Upon completion of all project tasks, students are partnered with other nonprofits to build web applications, giving the students practical development experience.
Thanks for Watching!
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https://www.youtube.com/watch?v=xZReLg8KaDo
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00 -
00-introduction-to-the-mongodb-and
This is a guide to setting up the database and glitch project for the MongoDB and Mongoose Course on freeCodeCamp. I found this really difficult to get working, and the guide seems quite outdated, so this is how I've done it.
Link to challenge : https://www.freecodecamp.org/learn/apis-and-microservices/mongodb-and-mongoose/
Written Guide : https://www.notion.so/ganeshh123/Introduction-to-the-MongoDB-and-Mongoose-Challenges-12b4ad2e0ac744f686405021c5556dd0
Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1QJMb63oecYZ3lLjrF4PnIs
All Writen Guides for this course : https://www.notion.so/ganeshh123/6f987e7260914612b06adf840dbb00c3
All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26
Concepts:
process.env
The process.env property returns an object containing the user environment.
https://nodejs.org/dist/latest-v8.x/docs/api/process.html#process_process_env
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MongoDB is a cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and licensed under the Server Side Public License (SSPL).
Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node.js. It manages relationships between data, provides schema validation, and is used to translate between objects in code and the representation of those objects in MongoDB.
freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS and JavaScript, students progress to project assignments that they complete either alone or in pairs. Upon completion of all project tasks, students are partnered with other nonprofits to build web applications, giving the students practical development experience.
Thanks for Watching!
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https://www.youtube.com/watch?v=NA1w1oWtUe8
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03 -
03-set-up-passport-advanced-node-and
We need to set up some node modules to store cookies for our sessions (express-session) and for authentication (passport). We have to mount these as middlewares for all routes.
Link to Challenge : https://www.freecodecamp.org/learn/quality-assurance/advanced-node-and-express/set-up-passport
Written Guide: https://www.notion.so/ganeshh123/Set-up-Passport-ac75ec24dd0d417492be86a5049d6ba5
Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1RL9djhgSH65pZhJ6xSyKX8
All Writen Guides for this course : https://www.notion.so/ganeshh123/ccf6039186334f83a54c1c9216f30e3c
All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26
00:00 - Introduction
00:32 - Express Session Setup - session()
https://www.npmjs.com/package/express-session#sessionoptions
03:32 - How Session Storage Works
06:20 - Passport Setup
passport.initialize()
Returns a middleware which must be called at the start of connect or express based apps. This sets req._passport, which passport uses all over the place.
https://github.com/jwalton/passport-api-docs#passportinitialize
passport.session()
"If your application uses persistent login sessions, passport.session() middleware must also be used." Should be after your session middleware. This returns a middleware which will try to read a user out of the session; if one is there, it will store the user in req.user, if not, it will do nothing.
https://github.com/jwalton/passport-api-docs#passportsessionoptions
08:07 - Challenge Solution
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Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting—running scripts server-side to produce dynamic web page content before the page is sent to the user's web browser.
Express.js, or simply Express, is a web application framework for Node.js. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js. Express runs between the server created by Node.js and the frontend pages of a web application. Express also handles an application's routing.
freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS and JavaScript, students progress to project assignments that they complete either alone or in pairs
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17 -
17-set-up-the-environment-advanced-node
If you're failing this challenge, go to 16mins 2s
To get started with our chat app, we need to set up socket, our database connection, and GitHub Authentication. After this, we can start creating a websocket between the client and server script for realtime communication.
Link to Challenge : https://www.freecodecamp.org/learn/quality-assurance/advanced-node-and-express/set-up-the-environment
Written Guide: https://www.notion.so/ganeshh123/Set-up-the-Environment-acf010081f6649ebb8eccfad69669058
Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1RL9djhgSH65pZhJ6xSyKX8
All Writen Guides for this course : https://www.notion.so/ganeshh123/ccf6039186334f83a54c1c9216f30e3c
All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26
00:00 - Introduction
00:20 - Example App
00:51 - Setting up Socket Server
http.createServer()
Returns a new instance of http.Server.
https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener
Server() - exposed by require('socket.io')
Creates an Instance of a Socket Server.
https://socket.io/docs/server-api/#new-Server-httpServer-options
server.listen()
Starts the HTTP server listening for connections.
https://nodejs.org/api/http.html#http_server_listen
03:05 - Setting up Socket Client
04:48 - Listening for a 'connection' event
06:10 - Project Setup
06:32 - Database Connection
09:13 - GitHub Login Setup
12:04 - What's in this project?
13:40 - Challenge Solution
16:02 - IMPORTANT - How to allow testing
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Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting—running scripts server-side to produce dynamic web page content before the page is sent to the user's web browser.
Express.js, or simply Express, is a web application framework for Node.js. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js. Express runs between the server created by Node.js and the frontend pages of a web application. Express also handles an application's routing.
freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS and JavaScript, students progress to project assignments that they complete either alone or in p
...
https://www.youtube.com/watch?v=XBiuB8ekvdE
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17 -
17-add-labels-to-d3-elements-data
Let's add some labels to our bars. We can use the SVG text element to render text on an SVG canvas. We can give this x and y attributes to position it correctly. Once again, we can use a function as the second argument in the attribute method. The d3 text method can be used for setting the content that goes inbetween tags.
Link to challenge : https://www.freecodecamp.org/learn/data-visualization/data-visualization-with-d3/add-labels-to-d3-elements
Concepts:
Text
The SVG text element draws a graphics element consisting of text. It's possible to apply a gradient, pattern, clipping path, mask, or filter to text, like any other SVG graphics element.
If text is included in SVG not inside of a text element, it is not rendered.
https://developer.mozilla.org/en-US/docs/Web/SVG/Element/text
selection.text([value])
If a value is specified, sets the text content to the specified value on all selected elements, replacing any existing child elements. If the value is a constant, then all elements are given the same text content; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s text content. A null value will clear the content.
If a value is not specified, returns the text content for the first (non-null) element in the selection. This is generally useful only if you know the selection contains exactly one element.
https://github.com/d3/d3-selection/blob/v1.4.1/README.md#selection_text
selection.attr(name[, value])
If a value is specified, sets the attribute with the specified name to the specified value on the selected elements and returns this selection. If the value is a constant, all elements are given the same attribute value; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s attribute. A null value will remove the specified attribute.
If a value is not specified, returns the current value of the specified attribute for the first (non-null) element in the selection. This is generally useful only if you know that the selection contains exactly one element.
https://github.com/d3/d3-selection/blob/v1.4.1/README.md#selection_attr
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D3.js (also known as D3, short for Data-Driven Documents) is a JavaScript library for producing dynamic, interactive data visualization
...
https://www.youtube.com/watch?v=3_eTqLXNaWo
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RESET
reset-windows-volume-mixer
This video shows you how to reset the Windows Volume Mixer to default levels after tweaking.
-----------------------------------------------------------------------------------------------
Links:
Written Guide: https://ganeshh123.github.io/tutorials/2020/05/02/reset-windows-volume-mixer.html
-----------------------------------------------------------------------------------------------
@ECHO OFF
NET STOP Audiosrv
NET STOP AudioEndpointBuilder
REG DELETE "HKCU\Software\Microsoft\Internet Explorer\LowRegistry\Audio\PolicyConfig\PropertyStore" /F
REG ADD "HKCU\Software\Microsoft\Internet Explorer\LowRegistry\Audio\PolicyConfig\PropertyStore"
NET START Audiosrv
-----------------------------------------------------------------------------------------------
Music:
'Fade' by Alan Walker : http://alanwalker.no/
Link : https://www.youtube.com/watch?v=bM7SZ5SBzyY
---------------------------------------------------------------------------------------------
Thanks for Watching!
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10 -
10-post-data-with-javascript
At 10:12 put a capital S in readyState and you should be gucci!
We can also post data using the JavaScript XMLHttpRequest. This time, we open it with a 'POST' attribute, set some headers specifying the content-type, and send it. We can register functions with the onreadystatechange to run code once we get a response.
Link to challenge : https://www.freecodecamp.org/learn/data-visualization/json-apis-and-ajax/post-data-with-the-javascript-xmlhttprequest-method
Concepts:
XMLHttpRequest.readyState
The XMLHttpRequest.readyState property returns the state an XMLHttpRequest client is in.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/readyState
XMLHttpRequest.status
The read-only XMLHttpRequest.status property returns the numerical HTTP status code of the XMLHttpRequest's response.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/status
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status
XMLHttpRequest.onreadystatechange
An EventHandler that is called whenever the readyState attribute changes.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/onreadystatechange
XMLHttpRequest.setRequestHeader()
The XMLHttpRequest method setRequestHeader() sets the value of an HTTP request header. When using setRequestHeader(), you must call it after calling open(), but before calling send(). If this method is called several times with the same header, the values are merged into one single request header.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate.
https://www.json.org/json-en.html
parse()
The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
stringify()
The JSON.stringify() method converts a JavaScript object or value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
XMLHttpRequest
XMLHttpRequest (XHR) objects are used to interact with servers. You can retrieve data from a URL without having to do a full page refresh. This enables a Web page to update just part of a page without disrupting what the user is doing. XMLHttpRequest is used heavily in AJAX programming.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest
XMLHttpRequest.open()
The XMLHttpRequest method open() initializes a newly-created request, or re-initializes an existing one.
ht
...
https://www.youtube.com/watch?v=j4wM2L9xcUI
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12 -
12-create-a-bar-for-each-data-point-in
We're gonna create some SVG rectangles to create bars for each data item in an array, to form the foundations of a basic bar chart.
Link to challenge : https://www.freecodecamp.org/learn/data-visualization/data-visualization-with-d3/create-a-bar-for-each-data-point-in-the-set
Similar Challenge : https://youtu.be/D0zzAn8T_g0
Concepts:
Rect
The rect element is used to create a rectangle and variations of a rectangle shape. The width and height attributes define the height and the width of the rectangle.
https://www.w3schools.com/graphics/svg_rect.asp
SVG Shapes: https://www.w3.org/TR/SVG2/shapes.html
SVG
Scalable Vector Graphics is an Extensible Markup Language-based vector image format for two-dimensional graphics with support for interactivity and animation. The SVG specification is an open standard developed by the World Wide Web Consortium since 1999. SVG images and their behaviors are defined in XML text files.
https://www.w3schools.com/graphics/svg_intro.asp
selection.style(name[, value[, priority]])
If a value is specified, sets the style property with the specified name to the specified value on the selected elements and returns this selection. If the value is a constant, then all elements are given the same style property value; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s style property. A null value will remove the style property. An optional priority may also be specified, either as null or the string important (without the exclamation point).
If a value is not specified, returns the current value of the specified style property for the first (non-null) element in the selection. The current value is defined as the element’s inline value, if present, and otherwise its computed value. Accessing the current style value is generally useful only if you know the selection contains exactly one element.
https://github.com/d3/d3-selection/blob/v1.4.1/README.md#selection_style
selection.attr(name[, value])
If a value is specified, sets the attribute with the specified name to the specified value on the selected elements and returns this selection. If the value is a constant, all elements are given the same attribute value; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s attribute. A null value will remove the specified attribute.
If a value is not
...
https://www.youtube.com/watch?v=YEi2k7m1p-c
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