Variables

What is a variable?

A variable is a named location in memory that can be used to store a value. Variables can be used to store any type of data, including numbers, strings, objects, and arrays.

Defining Variables

Variables are defined using the var keyword. The syntax for defining a variable is as follows:

<name> = <value>

For example, the following code defines a variable named x and sets it to the value 3:

x = 3

Reassigning Variables

The value of a variable can be changed by reassigning it. To reassign a variable, simply use the var keyword again, followed by the new value. For example, the following code reassigns the value of the variable x to 4:

x = 3
x = 4

Deleting Variables

Variables can be deleted using the delete keyword. The syntax for deleting a variable is as follows:

<name> = null

For example, the following code deletes the variable x:

x = null

Common Errors

There are a few common errors that can be made when working with variables. One common error is assigning a value to a variable that is not the correct type. For example, the following code will generate an error because the value "3" is a string, but the variable x is an integer:

x = "3"