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  1. Express/Node introduction - Learn web developme...

    Congratulations, you've completed the first step in your Express/Node journey! You should now understand Express and Node's main benefits, and roughly what the main parts of an Express app might look like (routes, middleware, error handling, and template code). You should also understand that with Express being an unopinionated framework, the way you pull these parts together and the libraries that you use are largely up to you!...js/JavaScript) Next In this first...Node Node (or more formally Node.js ) is an open-source, cross-platform...

    developer.mozilla.org/en-US/docs/Learn/Server-s...
  2. AbortSignal - Web APIs | MDN

    Learn about the AbortSignal interface, including its properties and methods, code examples, specifications, and browser compatibility.... js let controller; const url = "video...with an AbortError exception. js async function get() { const...

    developer.mozilla.org/en-US/docs/Web/API/AbortS...
  3. RangeError: argument is not a valid code point ...

    The JavaScript exception "Invalid code point" occurs when NaN values, negative Integers (-1), non-Integers (5.4), or values larger than 0x10FFFF (1114111) are used with String.fromCodePoint().... Examples Invalid cases js String.fromCodePoint("_"); //...fromCodePoint(NaN); // RangeError Valid cases js String.fromCodePoint(42); //...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  4. unescape() - JavaScript | MDN

    The unescape() function computes a new string in which hexadecimal escape sequences are replaced with the characters that they represent. The escape sequences might be introduced by a function like escape().... Syntax js unescape(str) Parameters str...unescape() . Examples Using unescape() js unescape("abc123"); // "abc123"...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  5. SyntaxError: negated character class with strin...

    The JavaScript exception "negated character class with strings in regular expression" occurs when a v-mode character class is negated and may be able to match a string (more than one character)....cases js /[^\p{RGI_Emoji_Flag_Sequence}]/v; Valid cases js // Matches...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  6. SyntaxError: for-in loop head declarations may ...

    The JavaScript strict mode-only exception "for-in loop head declarations may not have initializers" occurs when the head of a for...in contains an initializer expression, such as for (var i = 0 in obj). This is not allowed in for-in loops in strict mode. In addition, lexical declarations with initializers like for (const i = 0 in obj) are not allowed outside strict mode either....example throws a SyntaxError : js const obj = { a: 1, b: 2, c:...the head of the for-in loop. js const obj = { a: 1, b: 2, c:...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  7. BarcodeDetector - Web APIs | MDN

    Learn about the BarcodeDetector interface, including its methods, code examples, specifications, and browser compatibility.... js // check compatibility if (!("BarcodeDetector"...logs the results to the console. js // check supported types BarcodeDetector...

    developer.mozilla.org/en-US/docs/Web/API/Barcod...
  8. nonce - HTML: HyperText Markup Language | MDN

    Das nonce globale Attribut ist ein Inhaltsattribut, das eine kryptografische Nonce ("number used once", Zahl, die nur einmal verwendet wird) definiert. Es kann von der Content Security Policy verwendet werden, um festzulegen, ob ein bestimmter Abruf für ein gegebenes Element erlaubt wird oder nicht....js: js const crypto = require("crypto");...leerer String wird zurückgegeben). js script.getAttribute("nonce");...

    developer.mozilla.org/de/docs/Web/HTML/Global_a...
  9. Bitwise AND (&) - JavaScript | MDN

    The bitwise AND (&) operator returns a number or BigInt whose binary representation has a 1 in each bit position for which the corresponding bits of both operands are 1.... Try it Syntax js x & y Description The & operator...instead. Examples Using bitwise AND js // 9 (00000000000000000000) //...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  10. Object.is() - JavaScript | MDN

    The Object.is() static method determines whether two values are the same value.... Try it Syntax js Object.is(value1, value2) Parameters...other. Examples Using Object.is() js // Case 1: Evaluation result...

    developer.mozilla.org/en-US/docs/Web/JavaScript...