JavaScript Variables and Values

In JavaScript, variables are named storages where you can store various values like numbers, strings, and boolean values. With variables, you can change the values that a program uses and make the program more flexible.

Variables can be different data types, including:

• numbers (integers or decimal numbers)
• Strings (values in text format)
• Boolean values (true or false)
• lists (keeping multiple values ​​in one variable)
• objects (grouping data into one entity)

The creation of variables is usually done using the var keyword, which informs JavaScript that you are creating a new variable. For example, if you want to create a variable named "luku" and set its value to 10, you can write the following code:

var number = 10;

This creates a new variable named "luku" and gives it a value of 10. You can also update the value of the variable later during program execution by simply using the same name and setting a new value.

Variable names can include letters, numbers, and underscores, but they cannot start with a number. For example, the variable name "luku1" is allowed, but "1luku" is not allowed.

It is important to remember that the values of variables can vary and that variable names are case-sensitive. For example, variables "luku" and "Luku" are two different variables, and their values can vary independently of each other.

When using variables in a program, you can use various operators and functions to manipulate the values of the variables. This makes the use of variables a highly useful tool for creating complex programs.

Practice