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JavaScript Variables

Variables are what make up most of JavaScript. These variables make up things from numbers to objects, which are
all over JavaScript to make one's life much easier.


Defining a Variable


var myVariable = "This is a variable!";

This is an example of defining variables. This variable is called a "string" because it has ASCII characters (A-Z, 0-9,
!@#$, etc.)


Using a Variable

var number1 = 5;
var number2 = 10;

Here, we defined a number called "number1" which was equal to 5. However, on the second line, we changed the
value to 3. To show the value of a variable, we log it to the console or use window.alert():


window.alert(number1);

Output


To add, subtract, multiply, divide, etc., we do like so:


var addition = number1 + number2;
var subtraction = number1 - number2; 
var multiplication = number1 * number2; 
var division = number2 / number1;

Output


We can also add strings which will concatenate them, or put them together. For example:


var myString = "I am a " + "string!"; 

Output

I am a string


Conclusion

In this page (written and validated by ) you learned about JavaScript Variables . What's Next? If you are interested in completing Javascript tutorial, your next topic will be learning about: Javascript Variables Types.



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