JavaScript is the most used programming language in web development which was originally developed to add interactive elements to websites. Though JavaScript is influenced by Java, the syntax resembles C and has its roots in ECMA Script. To avoid this problem, we introduce you to JavaScript Assignment Help from one of the Best Assignment Helper.
The source code is processed by the client’s web browser rather than the webserver. In other words, the JavaScript functions run only after the webpage has loaded. It is a dynamic programming language that allows you to implement operations that can’t be done only by HTML and CSS. Without JavaScript, the only things left on the web will be HTML and CSS which unfortunately limit you to a very few webpage implementations. Without it, you only have the animations that are provided by CSS.
One of the major problems in JavaScript is the memory leak in it. A memory leak is a memory that is not being used anymore but hasn’t been returned to the OS and still is occupying space. We also provide Homework Help Online.
4 Types of Memory Leaks In JavaScript And How To Get Rid Of Them.
1. Mark-And-Sweep: One of the main causes of memory leaks is unwanted references. To solve this, most of the garbage collectors use the algorithms of mark-and-sweep. This algorithm consists of:
* Roots are global variables in which a reference is kept in code. The garbage collector builds roots. In JavaScript, the window acts as a root. The window is always present, so the garbage collector considers it as a present.
* Everything that can be reached through the roots is not considered garbage and all the roots are inspected and marked as active.
* All the pieces that are not marked as active are then returned to the OS by the garbage collectors.
2. Accidental Global Variables: Many times, there are a lot of global variables that go through unsuspected. This means that they are non-collectible. If you use global variables for huge data storage, be sure to null it or reassign the data after you have done using them. To prevent the mistakes, add ‘use strict; at the beginning of your JavaScript files which enables the stricter mode of parsing the files.
3. Forgotten Timers Or Callbacks: JavaScript often uses set intervals in the files. The libraries take care of the global variables. Sometimes, the global variables become unreachable after their roots become unreachable as well. To avoid this, you should make explicit calls to remove the unwanted global variables.
4. Closure: Closure is a key aspect of JavaScript development. It captures anonymous functions that capture variables from the parent scopes. The Meteor developers found a case in which it was possible to leak the memory due to JavaScript runtime implementations. Each of the scopes of closure has an indirect reference to the big array. An implementation of closures can handle this problem.
