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  1. Set.prototype.intersection() - JavaScript | MDN

    The intersection() method of Set instances takes a set and returns a new set containing elements in both this set and the given set.... Syntax js intersection(other) Parameters...numbers that are perfect squares. js const odds = new Set([1, 3, 5...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  2. ContactsManager - Web APIs | MDN

    Learn about the ContactsManager interface, including its methods, code examples, specifications, and browser compatibility.... js const supported = "contacts"...check for supported properties. js async function checkProperties()...

    developer.mozilla.org/en-US/docs/Web/API/Contac...
  3. Iterators and generators - JavaScript | MDN

    Iterators and Generators bring the concept of iteration directly into the core language and provide a mechanism for customizing the behavior of for...of loops.... js function makeRangeIterator(start...iterator then looks like this: js const iter = makeRangeIterator(1...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  4. console - Web APIs | MDN

    Learn about the console interface, including its methods, code examples, specifications, and browser compatibility.... For example: js console.log("Failed to open the...is to output a single object: js const someObject = { str: "Some...

    developer.mozilla.org/en-US/docs/Web/API/console
  5. FinalizationRegistry - JavaScript | MDN

    A FinalizationRegistry object lets you request a callback when a value is garbage-collected....registry passing in the callback: js const registry = new Finaliz...value and a held value for it: js registry.register(target, "some...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  6. Document: DOMContentLoaded event - Web APIs | MDN

    Learn about the DOMContentLoaded event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("DOMContentLoaded"...Event . Examples Basic usage js document.addEventListener("DOMContentLoaded"...

    developer.mozilla.org/en-US/docs/Web/API/Docume...
  7. FencedFrameConfig - Web APIs | MDN

    Learn about the FencedFrameConfig interface, including its methods, code examples, specifications, and browser compatibility....winning ad in a <fencedframe> : js const frameConfig = await navigator...using setSharedStorageCont() : js const frameConfig = await navigator...

    developer.mozilla.org/en-US/docs/Web/API/Fenced...
  8. Broadcast Channel API - Web APIs | MDN

    The Broadcast Channel API allows basic communication between browsing contexts (that is, windows, tabs, frames, or iframes) and workers on the same origin.... js // Connection to a broadcast...argument. An example string message: js // Example of sending of a very...

    developer.mozilla.org/en-US/docs/Web/API/Broadc...
  9. What went wrong? Troubleshooting JavaScript - L...

    So there we have it, the basics of figuring out errors in simple JavaScript programs. It won't always be that simple to work out what's wrong in your code, but at least this will save you a few hours of sleep and allow you to progress a bit faster when things don't turn out right, especially in the earlier stages of your learning journey....editor, we'll find this line: js guessSubmit.addeventListener("click"...you'll see the following code: js lowOrHi.textContent = "Last guess...

    developer.mozilla.org/en-US/docs/Learn/JavaScri...
  10. Web MIDI API - Web APIs | MDN

    The Web MIDI API connects to and interacts with Musical Instrument Digital Interface (MIDI) Devices....and (optional) sysex property: js navigator.permissions.query({...be called in a secure context. js let midi = null; // global MIDIAccess...

    developer.mozilla.org/en-US/docs/Web/API/Web_MI...