![]() Click one of the following buttons in the Coverage tab:.The Coverage tab opens in the Drawer.įigure 2. Start typing coverage, select the Show Coverage command, and then press Enter to run the command.If a user accesses the page on a mobile device, the extra code uses up their cellular data.The extra code slows down your page load.This extra CSS is a problem for the following reasons: So your page is downloading a bunch of CSS that it doesn't need. But you're not using any of the other Bootstrap components. It contains the CSS for all of Bootstrap's components. This stylesheet doesn't just include the code for the button component. To use the button component you need to add a link to Bootstrap's stylesheet in your HTML, like this. For example, suppose that you want to use Bootstrap's button component on your page. Shipping unused JavaScript or CSS is a common problem in web development. This guide doesn't cover how to refactor a codebase to avoid unused code because these refactors depend highly on your technology stack. ![]() But refactoring a codebase so that each page only ships the JavaScript and CSS that it needs can be difficult. Here’s a demo on jsFiddle for you to play around with.A word of warning. ![]() Let's check them out!įirst, let's say that we have this array of objects called "objArray": var objArray = [ There are A LOT of ways of achieving this, so I decided to put some of them together in this post to make it easy for you to pick up whatever works best for you. You may have seen yourself in this situation when coding in JavaScript: you have an array of objects, and you need to find some specific object inside this array based on some property of the object.
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