You can check for null in JavaScript by using the strict equality operator (===). For example: let val = null; if (val === null) { console.log('val is null'); } else { console.log('val is not null'); }

Float type in Java is a data type that stores a numerical value with decimal point and is used for floating point numbers. It is a single-precision 32-bit IEEE 754 floating point and holds a number ranging from 1.4e–045 to 3.4e+038 with 6-7 decimal digits of precision. A float type is a 32-bit number which is stored in 4 bytes of memory.

Deserialization in Java is the conversion of a sequence of bytes, either in a file or from a network connection, back into an object in memory. It is the reverse process of serialization, which is the conversion of an object into a sequence of bytes in order to be stored or transmitted.

The concept of a "PHP session" is inherently tied to the server-side language PHP, so you cannot start a PHP session in JavaScript. However, you can use JavaScript to send an AJAX request to the server, asking it to start a new PHP session. You can then store the session ID that is returned in the response in a JavaScript variable or cookie. You can then use that ID for further requests in order to keep the same session on the server.

LinkedList is usually preferred over ArrayList when frequent insertion or deletion is required since add/remove operation is more efficient in LinkedList in comparison to ArrayList which involves a shift operation while insertion or deletion. LinkedList also offers considerable advantage over ArrayList when working with large data sets in Java. LinkedList performance is better than ArrayList for manipulating data sets. LinkedList also implements Queue and Deque interface out of the box so we can use it for queue or double ended queue operations. It can also be used as List implementation for stacks.

Java fern typically grows to be 18-30 inches tall and 12-18 inches wide.

Java Platform Micro Edition (Java ME or J2ME) is a technology that allows developers to use Java to create applications and services for small devices such as mobile phones, PDAs, pagers, and smart cards. It simplifies the development process for these devices through the use of standardized application programming interfaces (APIs) and Javacard technology. J2ME also provides a secure, real-time application platform that allows developers to create applications and services tailored for smaller devices.

To change the src attribute of an image in JavaScript, use the following syntax: document.getElementById("myImage").src = "newImage.jpg";

The best way to learn JavaScript is to start by reading a few tutorials and books that cover the basics, such as Eloquent JavaScript or JavaScript and JQuery. Once you have a good understanding of the basics, you can then work on more challenging projects and practice coding using online coding platforms such as CodeCademy and Free Code Camp, which feature interactive programming challenges and tutorials to help you gain a more in-depth understanding of the language. Additionally, you may also want to attend local meetups, conferences, and workshops to get more hands-on experience.

Yes, JavaScript is an excellent language to learn. It can be used in a variety of web applications, and its usage is becoming increasingly more popular as the years progress. It is a powerful language that is supported by a wide range of web development/design tools, frameworks and libraries. If you're looking to develop web applications or become a full-stack web developer, JavaScript is well worth learning.