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10 Key JavaScript Functionality You Must Be Aware Of


Nowadays, being the best buddy of CSS3 and HTML5, JavaScript is broadly used by the developers. JavaScript has a great role in those responsive web applications that look superb on desktops, tablets and mobile devices (irrespective of their screen size). This is a versatile programming language, which makes it suitable to program desktop, website pages, applications, etc. Though it is a client-side scripting language, but it assists the users to build web apps that too without requiring to write long lines of the code. Having a set of reusable codes, it enables the developers to turn the codebase into modular one without having to repeat the code again and again.


Here a list of the top functions of JavaScript that every user should know about-




It is one of the simplest JavaScript function, which is commonly used by novice and experts. This function assists the developers to circulate a particular message to the users via a dialog box. This dialog box switches the cursor from a website page, and appeals the users and compels to read this message. And, it is possible for the users to shut down the dialog box by pressing OK button. Most of the times, the developers make use of alert() to ask the users to provide the most suitable input values via the forms.




Every time, a website page loads, the browser initiates the code processing from top to the bottom order. CSS, HTML, PHP or JavaScript code processes in order. But, the programmers get this flexibility to alter the code’s order execution with the use of onload function. The programmers can use this function to help the browser comprehend code’s execution sequence. Every time, a particular function executes once the web page loads. Thus, the users get the access or view the web page content as per the code that has been included in onload function.




This function allows the callback to be implemented more than a single time as per the assigned time frame. When you assign callback functionality to regularly-firing event, then it works handy. It works superb to accelerate the speed of events. The users can use it with resize, scroll, key event, etc.




Often, the programmers require validating the value by urging the users to provide their confirmation for the submitted input. Thus, they have to show the values as the strings irrespective of the data type. For this, the coders can implement toString() with diverse objects to show their value in the form of character. Moreover, they are not able to do value manipulation into the string or do any modification into the data type or original value of the variable.




This functions acts against the parsing problems caused by spaces, whitespaces or similar characters. For this, the programmers replace these characters with suitable Unicode characters. The inbuilt JS function assists the developers to eradicate the scope of parsing errors by exchanging with equivalent Unicode. They can also use decodeURIComponent() for decoding standard URL components.




This handy functionality enables the users to know whether a function will come into native category or not. To some extent it might seem pointless, but it is truly crucial in reality. If a developer comes to know that whether a functionality is native or not, he is able to override the risk factor. If you are aware of the risk in advance, then it is possible for you to track the why factor. And, this saves the developer from unexpected errors that might happen due to the posed risks.




This JavaScript function enables the user to incorporate a CSS rule within the present stylesheet. It is an easy function, which allows you to alter the stylesheet in the future as well. You do not require to turn back and customize the entire stylesheet. In JS, this function is used to get NodeList out of a selector, by offering it a specific style and further setting it to selector. So, you do not require styling every element, which might go along with the selector forever.




It enables the users to own an absolute URL. This is quite tricky to receive an absolute URL from the variable string. Thanks to this JS function, which makes this task a breeze. getAbsoluteUrl function works as a substitute to a URL constructor that might seem tough in use, in case, the needed arguments are not given on a regular basis. But, this feature helps one overcome this thing completely to own an absolute URL via the string input.




This function allows checking whether the given selector’s element matches or not. So, you can continue the validation of the element to move ahead. It lessens the count of errors, which you might face in the future. In case, you do not adopt the validation of the element, so it is possible for you to make modifications presently rather than guessing from where the errors will be coming in the future. 




To make things a breeze, this is a wonderful function of JavaScript. This function enables one to poll server periodically and request fresh information that can be fresh emails or messages. After this, the server gives response and sends fresh information to the clients. For a certain period of time, this practice is followed automatically in a consecutive manner. This way, the user does not have to check the updates manually.



Having a rich functionality, JavaScript will have its dominance as a scripting language in the future as well. And, with these superb functions, one can improve his knowledge and work criteria of the programs. Thus, implement these rich functions and present yourself as an expert JavaScript developer. At the same time, make all things simpler and easier.

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Bryan Lazaris

Bryan Lazaris is a senior JavaScript developer associated with HireWebDeveloper as a full-time employee. Apart from coding, he has a great interest in writing. With this write-ups, he shares JavaScript trends, benefits to hire JavaScript developer and more.

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