At 10:10, I meant to say set the HIGHEST value. We'll create two linear scales to dynamically scale the circles in a scatter plot. We need to create a scale to position our circle on the x axis, as well as another for the y axis, with our min and max values for the domain and SVG dimensions for the range. We'll alter our range to add some padding to ensure extreme values are visible within our SVG area. Link to challenge : https://www.freecodecamp.org/learn/data-visualization/data-visualization-with-d3/use-dynamic-scales Concepts: d3.min(iterable[, accessor]) Returns the minimum value in the given iterable using natural order. If the iterable contains no comparable values, returns undefined. An optional accessor function may be specified, which is equivalent to calling Array.from before computing the minimum value. Unlike the built-in Math.min, this method ignores undefined, null and NaN values; this is useful for ignoring missing data. In addition, elements are compared using natural order rather than numeric order. https://github.com/d3/d3-array#min d3.max(iterable[, accessor]) Returns the maximum value in the given iterable using natural order. If the iterable contains no comparable values, returns undefined. An optional accessor function may be specified, which is equivalent to calling Array.from before computing the maximum value. Unlike the built-in Math.max, this method ignores undefined values; this is useful for ignoring missing data. In addition, elements are compared using natural order rather than numeric order. https://github.com/d3/d3-array#max d3.scaleLinear([[domain, ]range]) Constructs a new continuous scale with the specified domain and range, the default interpolator and clamping disabled. If either domain or range are not specified, each defaults to [0, 1]. Linear scales are a good default choice for continuous quantitative data because they preserve proportional differences. Each range value y can be expressed as a function of the domain value x: y = mx + b. https://github.com/d3/d3-scale#linear-scales continuous.domain([domain]) If domain is specified, sets the scale’s domain to the specified array of numbers. The array must contain two or more elements. If the elements in the given array are not numbers, they will be coerced to numbers. If domain is not specified, returns a copy of the scale’s current domain. https://github.com/d3/d3-scale#continuous_domain continuous.range([range]) If range is specified, sets the scale’s range to the specified array of values. The array must contain two or more elements. Unlike the domain, elements in the given array need not be numbers; any value that is supported by the underlying interpolator will work, though note that numeric ranges are required for invert. If range is not spe ... https://www.youtube.com/watch?v=NZKJYwLdPQA

IMPORTANT - You must use Helmet version 2.3.0 to pass this test! Caching can be useful to improve performance, but we may need to disable it for security updates or development. Helmet's noCache() middleware can set some Headers to disable most types of caching. Link to Challenge : https://www.freecodecamp.org/learn/information-security/information-security-with-helmetjs/disable-client-side-caching-with-helmet-nocache Written Guide: https://www.notion.so/ganeshh123/Disable-Client-Side-Caching-with-helmet-noCache-8d8699473b3245cc959d2d76c29d95ad Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1TeEsQOdf1JmV8PnkQfEpQ4 All Writen Guides for this course : https://www.notion.so/ganeshh123/8ba82d9d1ff84c4583d6e9418ebe426b All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26 00:00 - Introduction 00:05 - What is Caching? 00:15 - Why might we want to disable Caching? 00:33 - Headers to disable Caching 01:07 - Use Helmet version 2.3.0 01:29 - Setting the Headers - helmet.noCache() Sets four headers, disabling a lot of browser caching. https://github.com/helmetjs/nocache 01:55 - Testing -————————————————————————————————————- HelmetJS is a type of middleware for Express-based applications that automatically sets HTTP headers to prevent sensitive information from unintentionally being passed between the server and client. While HelmetJS does not account for all situations, it does include support for common ones like Content Security Policy, XSS Filtering, and HTTP Strict Transport Security, among others. HelmetJS can be installed on an Express project from npm, after which each layer of protection can be configured to best fit the project. 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. 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 Jav ... https://www.youtube.com/watch?v=aKkm-ddvxfs

To create a registration form, in the POST route, we should create the user's document in the database if it doesn't exist, and then authenticate them using their new details. Link to Challenge : https://www.freecodecamp.org/learn/quality-assurance/advanced-node-and-express/registration-of-new-users Written Guide: https://www.notion.so/ganeshh123/Registration-of-New-Users-95c5dde654c44bc0b84596b0ded5c59a 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 00:16 - Registration Form 01:08 - POST Route 01:25 - 3 Steps to Registering a User 01:44 - Getting Form Data - bodyParser.urlEncoded() Returns middleware that only parses urlencoded bodies and only looks at requests where the Content-Type header matches the type option. A new body object containing the parsed data is populated on the request object after the middleware (i.e. req.body). https://github.com/expressjs/body-parser#bodyparserurlencodedoptions 02:18 - Middleware for Database Work 02:38 - Check if User Already Exists - db.collection.findOne() Returns one document that satisfies the specified query criteria on the collection or view. If multiple documents satisfy the query, this method returns the first document according to the natural order which reflects the order of documents on the disk. https://docs.mongodb.com/manual/reference/method/db.collection.findOne/ 04:34 - Creating a User Document in the Database - db.collection.insertOne() Inserts a single document into MongoDB. If documents passed in do not contain the _id field, one will be added to each of the documents missing it by the driver, mutating the document. http://mongodb.github.io/node-mongodb-native/3.6/api/Collection.html#insertOne 06:40 - Logging in the New User - passport.authenticate() This function returns a middleware which runs the strategies. If one of the strategies succeeds, this will set req.user. If you pass no options or callback, and all strategies fail, this will write a 401 to the response. https://github.com/jwalton/passport-api-docs#passportauthenticatestrategyname-options-callback 07:32 - Redirecting the User to their Profile 08:40 - Testing the Registration 10:30 - Challenge Solution 16:06 - Explanation of Solution -————————————————————————————————————- 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 ... https://www.youtube.com/watch?v=APQKQEbZm0M

Implement an algorithm to determine if a string has all unique characters. What if you cannot use additional data structures? 00:00 - Problem Introduction 01:10 - Brute Force Solution 07:45 - Optimizations 09:10 - Manual Method 10:32 - Optimal Solution - HashMap Optimization 19:08 - Implementation 22:42 - Testing 25:08 - Part B Optimal Solution - Sorting 31:46 - Part B Implementation 33:16 - Part B Testing 34:20 - Summary ———————————————————————————————————— Written Guides & Tutorials: https://tutorials.gn3.sh NOTE: I am not a teacher by any means, these videos are just to help me improve my understanding. Thanks for Watching! ... https://www.youtube.com/watch?v=GxDmv-EeWIg