In Javascript, I am sometimes too immerged in the idea that a function creates a new scope, that sometimes I even think the following anonymous function will create a new scope when it is being defined and assigned to onclick: ha link 1 ha link 2 ha link 3 ha l...
Time after time I find JavaScript code that has bugs caused by lack of proper understanding of how functions work in JavaScript (a lot of that code has been written by me, by the way.) JavaScript has functional programming characteristics, and that can get in our way until we decide to f...
2 Event 'load' doesn't work on JavaScript 1 Works as javascript, but doesn't work as a Greasemonkey script? 7 window.onload works in Firefox+Greasemonkey script but not in a Chrome userscript? 3 addEventListener only working at page refresh? 1 addEventListener and setInterval fail...
I suppose fundamentally, you can answer your question with a question. That question is, if you don't name the function how would you go about calling the function explicitly elsewhere? Of course, the example you provided would still work without a name so I'd suggest that it's as...
It did not work because we reset the local counter every time we call the function. A JavaScript inner function can solve this. JavaScript Nested Functions All functions have access to the global scope. In fact, in JavaScript, all functions have access to the scope "above" them. ...
In this case, the callback function within .then() is executed once the promise is resolved. Async/Await Using async/await is another way to work with asynchronous code in a synchronous-looking manner. The async keyword is used to define a function that returns a promise, and await is use...
Overall, this behavior needs to be kept in mind while writing functions in JavaScript. A good way to avoid the previous problem is to simply place the variables at the top of the local area in the function (hoist them yourself). It is always good to be conscious where you place your co...
function functionOne(_callback) { // do some asynchronus work _callback(); } function functionTwo() { // do some asynchronus work functionOne(() => { console.log('I am a callback'); }); } functionTwo(); When executing the above code, the last thing printed in the console is...
In order to explain how the createDelegate function works in thelast post, we have to understand JavaScript closures andFunction.apply(). Theapply()method is the easiest subject to tackle, so we'll start there and work up. Every function in JavaScript has a number of attached methods, includ...
This is, of course, somewhat clunky, and TC39 (the committee that works on the next version(s) of ECMAScript) continues to work on a more elegant, still-backwards-compatible solution. On jQuery Because jQuery makes such heavy use of anonymous callback functions, it uses thecallmethod interna...