the murmurous sea

www.geeksforgeeks.org/difference-between-node-js-require-and-es6-import-and-export/

Events mouseover/mouseout, relatedTarget :These events are special, because they have property relatedTarget If we don’t examine event.target inside the handlers, then it may seem that the mouse pointer left #parent element, and then immediately came back over it. But that’s not the case! The pointer is still over the parent, it just moved deeper into the child element. If there are some actions..

The DOMContentLoaded event fires when the document is loaded and the DOM tree is fully constructed. The load event fires when all subframes, images, stylesheets, scripts, etc have been downloaded. The lifecycle of an HTML page has three important events DOMContentLoaded : the browser fully loaded HTML, and the DOM tree is built, but external resources like pictures and stylesheets may be not yet..

1. Timeouts throttled to ≥ 4ms : In modern browsers, setTimeout()/setInterval() calls are throttled to a minimum of once every 4 ms when successive calls are triggered due to callback nesting (where the nesting level is at least a certain depth), or after a certain number of successive intervals. : In Chrome and Firefox, the 5th successive callback call is clamped; Safari clamps on the 6th call;..

1. The setInterval() function is commonly used to set a delay for functions that are executed again and again, such as animations. You can cancel the interval using WindowOrWorkerGlobalScope.clearInterval(). 2. If you wish to have your function called once after the specified delay, use WindowOrWorkerGlobalScope.setTimeout(). To call a function repeatedly (e.g., every N milliseconds), consider u..

https://dev.to/shoupn/javascript-fetch-api-and-using-asyncawait-47mp JavaScript Fetch API and using Async/Await dev.to : when using fetch, it could be chaining of .then()'s and this can lead into what is often referred to as callback hell, or nested callbacks. : But with Async/Await can have better readability. https://hackernoon.com/6-reasons-why-javascripts-async-await-blows-promises-away-tuto..

- Use JSON.parse() to parse the response for AJAX. : AJAX works with callbacks, fetch with Promises. Use JSON.parse() to parse the response for AJAX. - Use json() to parse the response for fetch. json.parse() 1. method 2. Synchronous 2. parses a JSON string, constructing the JavaScript value or object described by the string. 3. An optional reviver function can be provided to perform a transform..

includes() String.prototype.includes() : method determines whether one string may be found within another string, returning true or false as appropriate. : Polyfill(method) has been added to the ECMAScript 2015 specification and may not be available in all JavaScript implementations yet. However, you can easily polyfill this method. Syntax str.includes(searchString[, position]) - searchString : ..

1. object (In JavaScript, regular expressions are also objects. ) 2. is used for matching text with a pattern. 3. Regular expressions are patterns used to match character combinations in strings. 4. used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. 5. Starting with ECMAScript 6, new RegExp(/ab+c/..