The following code produces the desired result but is there a way to refactor it to eliminate the accumulator variable? const data = [ { id: “428”, date: “2017-01-24” }, { id: “526”, date: “2022-01-01” }, { id: “428”, name: “George” }, { id: “526”, name: “Sam” }, { id: “827”, name: “Dan” } ];… Read More eliminate a variable for an accumulation operation
I’m trying to change the class of an specific div that i click, using this: let divs = document.querySelectorAll(‘.x’); function idk(){ Array.prototype.forEach.call(divs, function(element) { element.classList.add(‘y’); Array.prototype.forEach.call(divs, function(element) { element.classList.remove(‘x’); }); }); } .y{ transition: 0.5s; transform: rotateY(180deg); } <div id=”d1″> <div id=”c1″ class=”x” onclick=”idk()”>a</div> <div id=”c2″ class=”x” onclick=”idk()”>b</div> <div id=”c3″ class=”x” onclick=”idk()”>c</div> </div> This code… Read More How can i get a index value of a div just clicking on it?
I have some code in a .js file that is used in checkboxes. When imported into the html, though, the first two checkbox sections work (location, pop) but the last one does not. When I have the js in the html instead of importing it, all three sections (location, pop, tuition) work… I’m not sure… Read More Javascript not working when imported into html from js file?
(React Problem) Let’s say we have array of objects like this: const books = [ { author: "Marcel Proust", title: "In Search of Lost Time", pageNumber: 123, }, { author: "James Joyce", title: "Ulysses", pageNumber: 123, }, { author: "Miguel de Cervantes", title: "Quixote", pageNumber: 123, }, { author: "Herman Melville", title: "Moby Dick", pageNumber:… Read More How to filter array of object depends on input onChange text (React)
is there a way calling the createElement() method inside checkbox.off().on(‘click’, function () {}) of checkBoxes() method? I cannot access the method inside the function within the method. class Lists { constructor() { this.currentList = []; this.completedList = []; } createElement( value1 = undefined, value2 = undefined, value3 = undefined, checkboxCheck = ” ) { value3.append(`<li… Read More Calling the this.method() inside function of another method
I have a output like this output : [{service: ‘xdc’},{service: ‘cddc’}, {service: ‘cdcd’},{service: ‘cddc’}] I need to convert like this output : [xdc,cddc,cdcd,cddc] >Solution : You can use Array.prototype.map() combined with Destructuring assignment Code: const output = [{service: ‘xdc’},{service: ‘cddc’}, {service: ‘cdcd’},{service: ‘cddc’}] const result = output.map(({ service }) => service) console.log(result)
I have a class set up with string keys, like this: class MyClass { constructor() { this.id = 0 this.data = [] } "GET /data"(req, res) { res.json(this.data) } } The goal is to dynamically loop over the functions in an instance like this: for (let key in new MyClass()) { console.log(key) } However, everything… Read More Javascript make object string keys enumerable
I have a rectangle class and I want to use shift to assign new values to this.x and this.y by the shift amount. For example, the coordinates were assigned (5,5) r.shift(3,3) will make this.x and this.y (3,3). Currently, my code makes x and y new values, it doesn’t reassign them. How would I go on… Read More How to set new values to a class
So I have these classes that I use to handle errors in different scenerios like so: export class APIError extends Error { public readonly statusCode: number; public readonly message: string; constructor(statusCode?: number, message?: string) { super(message); Object.setPrototypeOf(this, APIError.prototype); if (typeof statusCode === ‘string’) { message = statusCode; statusCode = null; } this.statusCode = statusCode ||… Read More Why is instanceof not working as expected in Typescript?
I’m trying to create custom find method using Array.prototype, I tried a lot of way but i just couldn’t break the loop for the first match: let arr = [“Bill”, “Russel”, “John”, “Tom”, “Eduard”, “Alien”, “Till”]; Array.prototype.myFind = function (callback) { for (let i = 0; i < this.length; i++) { callback(this[i], i, this); }… Read More How to create custom find method?