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  1. SyntaxError: \ at end of pattern - JavaScript |...

    The JavaScript exception "\ at end of pattern" occurs when a regular expression pattern ends with an unescaped backslash (\). In a regex literal, the backslash would cause the closing slash / to be a literal character, so this can only appear when using the RegExp() constructor....a single backslash character: js const pattern = new RegExp("\\");...double-escape the backslash: js const pattern = new RegExp("\\\\");...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  2. HTMLCanvasElement: captureStream() method - Web...

    Learn about the HTMLCanvasElement.captureStream() method, including its syntax, specifications and browser compatibility.... Syntax js captureStream() captureStream(frameRate)...document itself was loaded. Example js // Find the canvas element to...

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  3. HTMLElement: error event - Web APIs | MDN

    Learn about the error event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("error", (event)...width: 0; height: 0; } JavaScript js const log = document.querySelector("...

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  4. Making decisions in your code — conditionals - ...

    In any programming language, the code needs to make decisions and carry out actions accordingly depending on different inputs. For example, in a game, if the player's number of lives is 0, then it's game over. In a weather app, if it is being looked at in the morning, show a sunrise graphic; show stars and a moon if it is nighttime. In this article, we'll explore how so-called conditional statements work in JavaScript....else syntax looks like this: js if (condition) { /* code to run...is also perfectly legal code: js if (condition) { /* code to run...

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  5. Operator precedence - JavaScript | MDN

    Operator precedence determines how operators are parsed concerning each other. Operators with higher precedence become the operands of operators with lower precedence.... js console.log(3 + 10 * 2); // 23...right-associative, so you can write: js a = b = 5; // same as writing...

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  6. Object building practice - Learn web developmen...

    We hope you had fun writing your own real-world random bouncing balls example, using various object and object-oriented techniques from throughout the module! This should have given you some useful practice in using objects, and good real-world context....js files. These contain the following...of the script looks like so: js const canvas = document.quer...

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  7. Adding a new todo form: Vue events, methods, an...

    Excellent. We can now add todo items to our form! Our app is now starting to feel interactive, but one issue is that we've completely ignored its look and feel up to now. In the next article, we'll concentrate on fixing this, looking at the different ways Vue provides to style components....inside your <script> element: js import ToDoForm from "./components/ToDoForm...object so that it looks like this: js components: { ToDoItem, ToDoForm...

    developer.mozilla.org/en-US/docs/Learn/Tools_an...
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  8. Delta - MDN Web Docs Glossary: Definitions of W...

    The term delta refers to the difference between two values or states....compute the delta like this: js let deltaX = newX - oldX; More...update a saved previous condition: js let newX = oldX + deltaX; For...

    developer.mozilla.org/en-US/docs/Glossary/Delta
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  9. Type coercion - MDN Web Docs Glossary: Definiti...

    Type coercion is the automatic or implicit conversion of values from one data type to another (such as strings to numbers). Type conversion is similar to type coercion because they both convert values from one data type to another with one key difference — type coercion is implicit whereas type conversion can be either implicit or explicit.... Examples js const value1 = "5"; const value2...number using the Number() method: js sum = Number(value1) + value2;...

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  10. SyntaxError: duplicate capture group name in re...

    The JavaScript exception "duplicate capture group name in regular expression" occurs when a regular expression pattern contains two or more named capturing groups with the same name, and these capture groups could be matched at the same time....Invalid cases js /(?<name>\w+) (?<name>\w+)/; Valid cases js /(?<firstName>\w+)...

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