Since JavaScript is a loosely typed language, you are not required to correctly predict the kind of data that will be kept in a variable. Depending on the information you supply to a variable (such as this ‘ ‘ or ” ” to signify string values), JavaScript will automatically type it. The type of a variable, such as int, float, boolean, or String, must be declared in many other languages, including Java.
This has both good and bad effects. Even though the type system in JavaScript allows for a lot of freedom, it lacks the ability of a highly typed system to shout at you whenever you try to add an int to an object, saving you from being forced to spend hours debugging a type error.
The typing of JavaScript is ad hoc. A function does not need to accept an integer as a parameter, nor do you need to state clearly that a string is a string. JavaScript now has a lot of versatility.
In exchange for more security and trust in the code base, you have to give up a portion of the flexibility that comes with a loosely typed language.
Even though operators typically convert values to the appropriate type according to JavaScript’s loosely coupled typing system, there are some situations where we must do type conversions directly.
Despite the numerous methods in JavaScript to convert data between different types, there are two that are most frequently done −
- Values are converted to Strings
- Values are converted to Numbers
How Does the JavaScript Defer Tag Operate?
The following details describe how defer tag operates −
- JavaScript has an attribute called defer, which preserves a boolean value of true or false.
- JavaScript’s defer attribute is being used to load JavaScript resources (<script> files) just after HTML document’s core content has loaded.
- The user does not have to wait to view the page’s primary content after loading JavaScript tools; the remaining <script> files can be included afterwards.
- Application performance is enhanced by loading core content before <script> files. In order to decrease the running duration of the application.
Syntax
<body>
<script defer src="script.js"></script>
//Your code goes here
</body>Similar to how the defer attribute works, the async attribute also loads JavaScript tools in the same way. However, if we declare the defer attribute in one <script> file and the async attribute in another <script> tag, and both are defined inside the HTML body, JavaScript gives first priority to the defer attribute.
