I cant look for a value in a object array, it returns me error [closed]

Hello everyone I’m doing this music player and this is the song loader but the problem is that when I try to assing the value to song constant with lookSongbyId function it returns me an error idk why …

Why do I need this. keyword to reference a variable with the same name?

Good evening, This is my first post on stack overflow. I’m a newbie in programming and I can do many things in C++ – a language I love. However, recently I’ve moved on to javascript with the mission …

How to always make “this” keyword to reference the parent class (bind child methods to parent class)?

here is the simplest form of my problem: class Service1 { constructor() { this.name = ‘service1’ } getThisName() { console.log(‘Name: ‘ + (this && this.name)) } } const service1 = new …

How to use strict mode and not get an error in JSlint

Looking at all the information out there on JSlint (eg. here or here), the discussion goes something like this Always use strict mode since it catches many more errors. All you have to do is put ‘use …

How to access an array from the scope of a function

I’m trying to add an element into an array with the push() method but apparently, I can’t access that array from the scope of my function. Here’s a summary of my architecture : class Test{ myArray; …

A question regarding jQuery hover(), setInterval scope, and The “this” Problem —

UPDATE — from CertainPerformance: $(“.gallery-image”).each(function() { let callInterval; $(this).hover(function(){ clearInterval(callInterval); }, function(){ callInterval = …

Inner function does not return changes to variable assigned in outer function

I am attempting to modify the masterCounter variable within the timeKeyAdditionCheck function. Within the timeKeyAdditionCheck function, I successfully assign a value to masterCounter, but this change …

Declare global constants in function javascript on DOMContentLoaded

Is there any way to declare constants when the DOMContentLoaded event triggers, that are accessible outside? window.addEventListener(‘DOMContentLoaded’, () => { const button = document….

Preventing auto-creation of global variables in Javascript

I just spent some time debugging a problem that boiled down to forgetting to use the var keyword in front of a new variable identifier, so Javascript was automatically creating that variable in the …

What is the scope of variables in JavaScript?

What is the scope of variables in javascript? Do they have the same scope inside as opposed to outside a function? Or does it even matter? Also, where are the variables stored if they are defined globally? Answer TLDR JavaScript has lexical (also called static) scoping and closures. This means you can tell the scope of an identifier by looking at the source code. The four scopes are: Global – visible by everything Function – visible within a function (and its sub-functions and blocks) Block – visible within a block (and its sub-blocks) Module – visible within a module Outside