Variables are usually representative names present in the program. Take the example like X may certainly stand for any unknown value in algebra, variables which are used in programming for representing something else. Variables are like containers which usually contain data. You can give names to containers and later change the data in a variable right by using the name.
Without variables, each and every computer program certainly should have one purpose. In any one-line program, there is no use of variables:
alert(3 + 7);
The purpose is certainly to add together the numbers 3 and 7 and then to print the result in the popup window of a browser. There is not much use of the program unless one needs to recall the sum of 3 and 7 on daily basis. With variables, there can be a general purpose program which can add any two numbers together and then print out the result like:
var firstNumber = 3; var secondNumber = 7; var total = Number(firstNumber) + Number(secondNumber); alert (total);
The program can also be modified by expanding the program asking the user for two numbers and then adding them together like:
var firstNumber = prompt("Enter the first number"); var secondNumber = prompt("Enter the second number"); var total = Number(firstNumber) + Number(secondNumber); alert (total);
The Document Will Read As Follows:
<html> <head></head> <body> <script> var firstNumber = prompt("Enter the first number"); var secondNumber = prompt("Enter the second number"); var total = Number(firstNumber) + Number(secondNumber); alert (total); </script> </body> </html>
Local variables are usually preferable to using globals as limiting scope of the variables will reduce the chance of accidentally overwriting the value of a variable with another variable of the same name. Using globals can create problems in the program making it difficult to track it down and fix. It is advisable never to create variables without the use of var keyword. Global variable can also be created with the use of a var keyword and can be done in that way.
In some occasion, the program may have need for variables which cannot be changed. In those cases, one can declare the variable with the use of const keyword. For example:
const heightOfTheEmpireStateBuilding = 1454; const speedOfLight = 299792458; const numberOfProblems = 99; const meanNumberofBooksReadIn2014 = 12;
In most cases, constants usually abide the same rules like other variables but once one can create a constant then its value cannot be changed right during the lifetime which will last during lifetime.
Number("42") // returns the number 42
parseFloat("10"); // returns 10 parseFloat(100.00); //returns 100.00 parseFloat("10"); //returns 10
Boolean data type or Boolean variables store one of the two possible values which can be either true or false. This term Boolean is named after George Boole (1815- 1864) creating an algebraic system of logic. Since it is the name of the person, so it is written with initial capital letter.
<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var isItGreater = Boolean (20 > 2); document.getElementById("demo").innerHTML = isItGreater; </script> </body> </html>
NaN data type usually stands for Not a Number. It is usually the result one can get when they try to do math with a string or when calculation fails or it cannot be done. Take the example like it is impossible to calculate the square root of a negative number.
<script> var areTheySame = Boolean ("tiger" === "tiger"); document.getElementById("demo").innerHTML = areTheySame; </script>
“I think the Software Testing Course is apt for me. Webskitters Academy has offered me the best experience for online training. Every learner can learn more about several concepts. The assignments to write Test cases and Test case Scenarios equipped me to learn to work on real-time projects. I got a job at a reputed firm with the help of the placement cell of this institute. I am extremely happy.”
“After the Software Testing course at Webskitters Academy, I now have the confidence to face testing interviews. I trusted the institute and here they gave me the best of the best. The assignments are great and they helped me to think out of the box and come up with new questions. I am extremely happy and satisfied and also got a job through this institute.”
“I am 100% content with the Software Testing course at Webskitters Academy. The professionals explain every question and doubt that aroused in my mind. The entire course is explained the thorough and step-by-step process. It is very professional but the learning method and environment are very friendly.”
“I am glad that I took the decision of joining Advanced PHP and MVC (Laravel) online course at Webskitters Academy. I joined the course during the lockdown, to learn programming. However, it is turned out to be more than just a course. It became my passion. The tutors were so good and encouraging. I even got a good placement during the pandemic, just a few days after the completion of the course.”
“Learnt PHP Laravel under Swarup Kumar Saha Sir. He is very helpful and excellent trainer. I am done this course online. The training was good I improved my coding skill and also improved my communication skills.”
“Learnt PHP With Laravel under Swarup Kumar Saha Sir. He is an excellent trainer. The training was good I improved my coding skills as well as communication skills.”
“I did training on Android App Development using Core Java from here. I guess, I couldn’t have find a better faculty than Swarup Sir. The thing I liked the most is that he is very friendly and always eager to help us on any terms. Apart from teaching us Android in a very great way, he helped us in personality development too, as he always motivated us in a good way. So, I guess these training days were not only for learning but also for finding our own skills and mastering them. Thanks to Webskitters for providing us this opportunity. I would like to learn more from here.”
“I had a fantastic experience with this academy. I trained by professionals. I learned Android App Development using Core Java properly and got a job very early in a reputed software company through this academy. Many many thanks to Amit sir, Riyanka ma’am and Debjit sir.”
“I have done Android App Development using Core Java training from this academy for one month. They cover most of topic in one month. Trainer (educator) was very supportive and polite.”
“Right after completing my Android App Development with KotlinCourse at Webskitters Academy, I landed a job in a reputed firm. This was an incredible experience for me as before that I was looking for a job for almost a year but failed to get any. Thanks to the professional training I took from the experts that helped me start my career instantly.”
We are glad to have hired the students from Webskitters Academy! We have to mention that they are trained to be the professionals. From the first day onwards, they have shown their excellence, and it is very impressive. Our team is also happy with their involvement and performance. Looking forward to hire more excellent students from them!
We are happy with the quality of training that the Webskitters Academy students have received. Few of them have been on-board with us recently and they have impressed us. We would recommend our associates to hire freshers from this institute, they make sure that the students are well-trained and prepared for the industry.
We hired the students from Webskitters Academy and to our surprise we found out that they are brilliant in their work! No way we can call them students, they are professionals. They know their work, have the skills and are well-groomed for the profession. Thanks, Webskitters Academy for such a comprehensive training!
“It was for the first time that we hired students from Websitters Academy. We had some doubts regarding freshers, but to our surprise, they are very good in their work. They know exactly how to do a particular job keeping the industry standards in mind. Our organization is happy to have them. Their codes, and development skills are perfect, suitable for the industry. It proves that they have been trained comprehensively. Good work by the faculties of Webskitters Academy. We will definitely recruit more young talents from you.”