Tech World Software School

The lecture goes over some HTML tags to mark some inline text in a particular way. You learn to mark text as being of strong importance, which by default visually appears in bold letters. You learn to emphasize text, which by default visually appears in slanted italics font style. The lesson also mentions how the bold tag and the idiomatic text tag were also used to visually bolden and italicize text. However today it is preferred to use the semantic tags strong and em due to their not necessarily being tied to a visual representation that could be changed. Documents can be read and understood semantically, the visual aspect being isolated from the meaning of the tags.

A lesson that introduces you to HyperText Markup Language (HTML), a technology that is used to create websites. You learn to create a tag with a paragraph element to display some text on a web page document.

An introduction to Cascading Style Sheets (CSS) to change the visuals of a web page written in HyperText Markup Language (HTML). You learn how to use a type selector to style all paragraphs in a document with basic CSS properties such as color, background color, and text align. The lecture also teaches how to use the browser developer tools (DevTools) to help you with development. It allows you to change the style and see the outcome in real time. It is very useful to debug CSS. You also learn other CSS properties related to the font of a text. For example, changing the size, family, and weight. The lecture also teaches you how to select HTML elements for styling according to their ID or class attribute.

Learn to isolate a React.js component in a separate file, a common practice especially if your codebase is large and you want to separate the concerns and single out responsibility. In particular, take the colored Box component and move its definition to its own file Box.js instead of defining it in the same file as the App component.

Continuing from the example of using the library React.js to build user interfaces. In this particular situation, a colored Box component whose color is controlled via a property. Now the goal is to change the color of a Box component using a text field. Using the hook useState, you can keep track of another state variable to hold the color name. That value is tied to an input of attribute type having the value text. That input is placed next to the existing button to change the color. You learn about controlled components, those whose value and onChange props are defined explicitly and controlled using a React state value. A function is defined to handle the changing of the text. That is, when the user types into the text field, the onChange handler function is called to update the value in state. An event handler function has a parameter called event that includes details about who triggered the event. In particular, you can use the event target to access the input element so that you can retrieve the value that was typed by the user. You can call on the mutate function for the color name to update its value after the user types into the text field. Then, the click handler for the button to change color is modified to set the Box component color prop to the value that was typed into the text field for the color name. That is, the click of the button takes the state value for color name and uses that as the prop passed to the Box component. The lesson also briefly mentions how in the past React.js components used to be mostly written with classes instead of functions. But that paradigm has since been changed and writing functional components is more encouraged now. Questions about the order of JavaScript code statements are also addressed, like the definition of a function inside a function and the order the functions are defined.

Continuing the example of colored Box components in React.js, the lesson explains how to listen to and handle click events. More specifically the goal is to click a button to change the color of an existing box. You are introduced to the concept of state using the useState hook to keep track of a color name. See how you assign the return value of the useState hook to two variables created via destructuring of an array. One variable to access the state value and another to mutate (modify) that state value. When the React state changes, the component renders anew. That is, the function that defines the component is called again and if any values have changed from a previous render, they will be reflected in the updated document object model (DOM) for the web application.

The lesson goes over creating your own React component. In particular, you create a component to make a square box. Reactjs is a frontend library that helps you build user interfaces with the JavaScript programming language. You learn how to instantiate a component in JSX, simply using a tag like you do in HTML. You also learn to pass information down to the component via props (short for properties). You also learn that you can pass information between the open and close tags of the component, which is a special props called children.

A lesson for beginners that introduces the library React.js that is used to build user interfaces (UI). It's part of frontend development in the browser, although learning the way of writing React can also translate to other platforms such as mobile with React Native and virtual reality with React VR. CodeSandbox is leveraged as the development environment, although other web-based alternatives are also available. You can also develop locally, generating the project with a tool like create-react-app. Writing an HTML-like pattern within JavaScript is also introduced. JSX transpilation is briefly explained using the Babel website's Try it out feature. The lesson goes on teaching how to change the view that is rendered by the React component. You learn to return multiple things from a component function using a Fragment. Finally, you briefly see, using the browser Developer Tools (DevTools for short), how the React.js application is injected in a lone, empty div element whose id is root.

An introduction to HyperText Markup Language (HTML) to create websites. You learn how to build paragraphs, mark inline text with strong importance or emphasis, add headings level one through six. The lecture also goes over bulleted and numbered lists. You learn to link text to another page using the anchor tag. The lecture also shows you how to display images. A brief intro to composing a form is also presented, so you get exposed to controls such as text field, text area, date field, button.

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A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/occupations Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/draw-the-triangle-2 Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/japanese-cities-name Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/binary-search-tree-1 Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/draw-the-triangle-1 Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/the-pads Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/average-population-of-each-continent Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/african-cities Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/asian-population Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/earnings-of-employees Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/the-blunder Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/population-density-difference Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/japan-population Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/average-population Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. https://www.hackerrank.com/challenges/revising-aggregations-the-average-function Learn: Building a News Blog Web App with Next.js and Express https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/