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  1. ReadableStream - Web APIs | MDN

    Learn about the ReadableStream interface, including its constructor, properties, and methods, code examples, specifications, and browser compatibility....of syntax: js const stream = new ReadableS...the stream's values() method: js for await (const chunk of stream...

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  2. class - JavaScript | MDN

    The class declaration creates a binding of a new class to a given name.... Try it Syntax js class name { // class body }...binding is constant like const . js class Foo { static { Foo = 1;...

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  3. Setting up your own test automation environment...

    This module should have proven fun, and should have given you enough of an insight into writing and running automated tests for you to get going with writing your own automated tests....js, as it is quick and easy to get... webdriver.io and nightwatch.js are also good choices. To install...

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  4. async function - JavaScript | MDN

    The async function declaration creates a binding of a new async function to a given name. The await keyword is permitted within the function body, enabling asynchronous, promise-based behavior to be written in a cleaner style and avoiding the need to explicitly configure promise chains.... Try it Syntax js async function name(param0) {...consider the following code: js async function foo() { return...

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  5. yield* - JavaScript | MDN

    The yield* operator is used to delegate to another iterable object, such as a Generator.... Try it Syntax js yield* expression Parameters...those which are yielded by g2() . js function* g1() { yield 2; yield...

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  6. A first splash into JavaScript - Learn web deve...

    Now you've learned something about the theory of JavaScript and what you can do with it, we are going to give you an idea of what the process of creating a simple JavaScript program is like, by guiding you through a practical tutorial. Here you'll build up a simple "Guess the number" game, step by step....inside your <script> element: js let randomNumber = Math.floor(Math...below your previous JavaScript: js function checkGuess() { alert("I...

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  7. HTMLScriptElement - Web APIs | MDN

    Learn about the HTMLScriptElement interface, including its properties and methods, code examples, specifications, and browser compatibility.... js function loadError(oError) {...as children of the <head> tag. js function loadError(oError) {...

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  8. Syntax sections - The MDN Web Docs project | MDN

    The syntax section of an MDN reference page contains a syntax box defining the exact syntax that a feature has (e.g. what parameters can it accept, which ones are optional?) This article explains how to write syntax boxes for reference articles....JavaScript function): md ## Syntax ```js-nolint slice() slice(start) slice(start...used in this case is js-nolint , where js indicates that JavaScript...

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  9. Regular expressions - JavaScript | MDN

    Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. These patterns are used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. This chapter describes JavaScript regular expressions. It provides a brief overview of each syntax element. For a detailed explanation of each one's semantics, read the regular expressions reference....between slashes, as follows: js const re = /ab+c/; Regular expression...the RegExp object, as follows: js const re = new RegExp("ab+c");...

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  10. SyntaxError: missing formal parameter - JavaScr...

    The JavaScript exception "missing formal parameter" occurs when your function declaration is missing valid parameters....values for their parameters: js function square(3) { return number...identifiers in function declarations: js function square(number) { return...

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